Update (07-12-2023):
As Warframe's popularity grows, the influx of new players, or burnt out jaded veterans who refused to go out and touch grass.
Warframe's community can no longer be counted as one of the best out there.
The amount of players who complain for the sake of complain, without any ounce of constructive feedback, while being inexperienced, ignorant, or just outright bad players, is on the rise with no sign of stopping.

I strongly advise going into this game with friends you already know, unless you take no issue with solo experience. (Public experience in-game matchmaking is still decent, this updated review is regarding Warframe's community specifically)

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High octane third person action PvE focused game play, paired with incredible audio and graphics. As well as one of a kind design and art style!

Free to play game with plenty to grind, but fear not, for there is no such thing as "Pay to Win" in this incredible title. Every single in-game item, bar pure cosmetics, can be earned through sheer effort.

💞F.Y.I. / P.S.A. -
The 'Platinum' (Premium currency), could be earned either by purchasing regularly, or by trading in-game items with other players. 20%~75%off Platinum coupons also available as a chance for daily login rewards. *Daily login rewards counts days logged in, does not reset due to missed days. There are also premium and unique item as milestone rewards.

Main use of 'Platinum' mainly resides in fast forwarding game content (majority of items requires a "build" time), as well as additional Cosmetics for your in-game characters. Though fast forwarding is not necessary for players who possess a job, a life, or anything of the sort.

💞Server, Game Type, etc -
Peer to Peer, 4 player Co-Op actions.
With community spaces hosted by Game's server.
With ability to switch to > Public, Friends Only, Invite Only, Solo matches. ***Game needs to stay connected to internet at all times, even Solo.***
Main game content - PvE with plenty different mission types.
But PvP, and PvP balanced game play, PvP cosmetic rewards also available (Albeit not at all popular)
Warframe's style of Rocket League also present. (Again, rather not popular)

💞Game provide unique movement system -
Wall run. Latching on walls. Zipping through the air. Running across a zip line. Provides both a horizontal and vertical dynamics, not to mention: Space battles, as well as "aircraft" and hoverboard, pegasus exists to help you traverse some of your missions, or open world contents.

💞Battle system -
Third person shooter-esque. Dynamic gun and blade actions, as well as different variants of range and close range weaponry. If you can imagine it, it probably already exists! Gunblade, Staff that shoots corrosive, Railgun, Automatic shotgun in a pistol size, a scythe that spits toxin, chainsaw on both fists, magic book Grimoire, and so much more. Or if you're more old school, regular assault rifle, as well as pump action shotgun, or double barrel shotgun exists as well. And with late game content, you could even get your hands on some weapons that can transform! (IE. Marksman Rifle > Gatling gun)

💞Companions -
You want a sentinel that floats above your shoulder, that does all sorts of things and not limited to helping you shoot enemies in the face?!
Or a bi-pedal robotic pet that waves back?
Or perhaps something organic, like an unconvential cat, or dog.
Warframe got it.

💞Content -
No end game, but want to know what its got?
🎀Over 200 mission nodes, packed with over 20 different mission types.
🎀Rogue-lite Souls-esque mode, that the more activity you do, the more powerful you'll be.
🎀Hourly special missions that reward above average amount.
🎀Daily special missions that provide a moderate challenge.
🎀Weekly special missions that award players with a special resource that they need.
🎀Several (almost)monthly re-occuring events that rewards players with time limited and special rewards.
🎀Annual special missions, such as Halloween events. Warframe also celebrates its anniversary by giving out free anniversary weapon sets and cosmetics!
🎀Your own personal nemesis! Created by you and you only
🎀Large scale space battle, with your very own battleship. Almost Star-Trek esque!
🎀So much more to list!

There's ALWAYS something to do in Warframe.

Also possesses three complete Open Worlds that provides their own rather challenging content for experienced players, and MORE TO COME!

💞Game updates -
Almost weekly. From hotfixes that patch up bugs and increases quality of life to new play-able content almost bi-weekly.
🎀Developer also hosts a Twitch stream bi-weekly. Tune in with your account to have a small chance at winning huge amount of platinum and premium prizes! And right after the stream (ONE hour long usually), there will be TWO in-game special missions that lasts for TWENTY-FOUR hours that reward players for hard to get items. - https://www.twitch.tv/warframe

💞Game age - 10 years old, and with how the game is developing, it does not seem to have any intention to stop!

💞Fair warning -
12 hours for a single player game is often considered the average play time. 48~60 hours if you really squeeze the content.
300 hours for a multiplayer game is often considered quite substantial.

For Warframe, anyone who are under 1000 hours would still be considered a relatively new player. There's just that many in-game items to collect, lore to discover, and content to play.

💞Ultimately -
Easy to pick up, but so ♥♥♥♥♥♥♥♥ much to learn!!!
Community Wiki available 24/7 to aid you in your quest - https://warframe.fandom.com/wiki/WARFRAME_Wiki
Or try the Official forum with friendly staff, and players -
https://forums.warframe.com/