OK lets start with the worst. This build: Gyrocopter: Fireball, Atrophy Aura, Stone Form, Greevil's Greed, Essence Shift (agi), and Marksmanship; is broken. You take first point in Greevil, second in Fireball, 1 in everything else, max Atrophy Aura and close the game in under 15 minutes once you get Aghanims Scepter on Gyrocopter. Probably ban Marksmanship on Gyrocopter as a troll combo due to its synergy with his ags?

Now for a brighter note. I have suggestions for recommended builds on the front page!
As a reference of skill, I'm around 3.5k mmr on US East

Build #1: Monkey Business
Monkey King: Mirror Image, Reality Rift, Bash of the Deep, Moon Glaives, Prowler Aura, Juxtapose. The reason we pick Monkey King is so in case an enemy uses Strafe, we still be able to land our hits. Also, Monkey has some AMAZING stat gains. Value point in Mirror Image to give you extra illusions in the early game and more chances for a bash. Reality Rift is your gap closer and causes confusion. Bash for pinning down your enemy, can be substituted with Geostrike/Timelock if banned or if you prefer either of the latter. Moon Glaives allows easy sieging and deals with other illusionists with ease. It also provides an easy way to catch up through the jungle if you get harassed out of your lane. Prowler Aura stacks with all of your illusions making you very hard to bring down, and is very powerful at level 1 for keeping your wave pushed out! Prowler Aura is often banned and can be substituted for the Foreman's Aura or other useful single point ability. The main counters are anyone who takes Split Shot AND Moon Glaives, or someone with Tidebringer. Executing this build is pretty easy if you understand the basics of controlled units, and wins most games.

Build #2: That's got to be the best pirate I've ever seen
Kunkka: Tidebringer, Bloodrage, Psi Blades, (QoP) Blink, Greevil's Greed, Coup de Grace. Have you ever wanted to be the best pirate anyone has ever seen? Look no further than this build! Use the extra Tidebringer damage to deny/lasthit creeps along with Psi Blades for even more lane dominance. In the mid/late game try to land your Psi Blades along with your Tidebringer for enough damage to send the enemy straight to Davy Jone's Locker. A value point in Greevils Greed to speed up your Daedalus and Rapier timings, A point in Blink to escape a few unsavory swashbucklers, and you're on your way to dominating the Seven Seas matey! If you ever wondered why all the mid Kunkka players in your pubs by Armlet, it gives the most raw damage-per-gold to STR heroes out of all the items making it a must have! Theres no real reason to pick Kunkka, we just want a STR hero. But then you wouldn't be the best pirate! The big counters are Blademail, Bristleback (the ability) and Dispersion. I would say this is the easiest build to execute of my favorites, and stronger than most builds I've seen.

Build #3: Rupture 2.0
Pugna: Walrus Kick, Meat Hook, Boulder Smash, Bloodrage, (QoP) Blink, Rupture. This is a modified version of the classic Rupture build on the front page. Your combo is Bloodrage (self or enemy), Rupture, Walrus Kick, Meat Hook, Boulder Smash. Your enemy should be dead. A blink ability is added for much needed initiation and escape. The counters include anything that can interrupt your combo (Doppelgänger, Mirror Image, Phantasm) and damage mitigation like Dispersion and Bristleback (the ability). And of course, Blademail. This build is the most simple to execute, but not quite as flashy or powerful as some others. If you miss Rupture or your combo doesn't kill, you're out of luck!

Build #4 WEATHERMAN
Skywrath Mage: Lightning Bolt, Chakra Magic, Multicast (LOD), Nimbus, Bloodrage, Nethertoxin. Your combo is rather straightforward. Bloodrage yourself, Nethertoxin the enemy, Chakra yourself, Lighting Bolt (x2). MAKE SURE you Bloodrage and Nethertoxin first, otherwise you won't be able to use double bolt. You may not need Nethertoxin as much if there is no Tank build on the enemy side, however the magic amp can pack quite a punch! Your first item choice should be a Scythe of Vyse or Rod of Atos (Kaya if you aren't relying on Nethertoxin). This enables you to get your combo off on enemies in Nethertoxin much more easily than without either Scythe or Rod. Call down Nimbus storms as needed. Things start to get crazy once you unlock multicast Nimbus. The most important thing is that you take Lightning Bolt. I cannot count how many times I've seen noobs take a useless point in Nimbus because they didn't put Lightning Bolt in their build. The full combo with an extra lockdown item can be tricky to pull off at first, but like everything it just takes a bit of practice. Always keep an eye on the map for a good nimbus placement!

Build #5 Mr. Steal yo INT
Oracle: Arcane Orb, Overpower, Essence Aura, Essense Shift (int), Shadow Dance, Ball Lightning. We want Oracle because of his incredible BAT at 1.4, bested only by Dark Willow at 1.3 and Chemical Rage. However we don't want Willow because Oracle has better stats, and 0.1 BAT isn't worth those precious stats. The hardest part of this build is getting past the landing stage. Take 1 point in everything (Essence Shift first for better harass) max Essence Aura and then max Arcane Orb. You only want 1 point in Ball Lightning because you can attack inside the Ball, and we want to move as slow as possible to get off as many attacks as possible while inside our invincibility. You don't need more than 1 point in Shadow Dance either. You can go for a more aggressive ability other than Shadow Dance, but its incredible utility providing information, escape, regeneration and speed are unmatched in my opinion. And don't be afraid to go for those level 10 and 15 talents (another reason we love Oracle here) +25% exp and +120GPM is very good. And totally doable if you take 1 point in Essence Shift, Shadow Dance and Ball Lightning. Your only counters are silences and running out of mana, making item choices and timings on this build extremely important. I would say this build is the hardest to execute, but definitely the most powerful of my favorites.

I hope this was useful and helpful! I haven't seen any new builds added to the front page in years so I hope this spices up the game a bit with some new ideas! I absolutely love this game but unfortunately I have to step away for a while with my new responsibilities as an adult. Keep up the great work :) Good luck and have fun to all of you :)