DLC ranking ?

[Kali]

1- Adventure
2- Studios
3- Spooky
4- Vintage
5- BTTF Construction Kit
6- Knight Rider CK
7- The Munsters Munster Koach CK

And yours ?

[Snow]

1-Adventure
2-Spooky
3-Vintage

Dont own the others :D

[Honelith]

1. Soaked!
2. Wild!
3. Vintage.
4. Spooky.
5. Adventure.
6. Studios.

[cerealfruitcake]

1. Adventure (my fav theme in RCT)
2. Spooky (I use it a lot)
3. Vintage (love the rides)
4. Studios (good for animatronics but I use it the least)
5. The Munsters (great for spooky theme)
6. Back to the Future (don't really use it)
7. Knight Rider (don't really use it)

[IndoorBear]

1. Studio
2. Adventure
3.Spooky
4.Ghostbusters
5.Classic Rides
6.Worlds Fair
7.Magnificint rides
8.Vintage
9.Back to the future
10.KNight Rider
11.Munsters
This list is hard as all the packs are useful but it depends on what you like to build!

[grampers62]

Must-haves adventure, worlds fair, spooky.
All the rest are what ever appeals to the individual and what one wants to do.
Studios could be a must-have if you want to do a lot of animatronics and effects.