I've searched for a very long time, now, for an MMO which captures that special feeling of cooperative exploration, that feeling of progression that only comes from using the variation within classes to overcome an obstacle in the environment.
Like the single-player games that let you control multiple "classes", one at a time, making you switch between them to proceed. Like X-Men Legends, Trine, Golden Sun, Secret of Mana, Mystical Ninja Goemon, Donkey Kong 64, and the awesome-but-too-short original Last Airbender game on the GBA, among many others I've forgotten.
Instead of one player switching around, I want to be in a party of multiple players, all using their class' particular gifts on their own whenever they are needed - solving a puzzle or just clearing an obstacle.
I haven't really found one, yet, though. No luck whatsoever. WoW had it at first (granting underwater breathing, water-walking, slow-falling, lock-picking), but never bothered to make much use of those skills - and all it focuses on now is holy trinity combat raids. City of Heroes teased (granting group invisibility, group teleporting, group flight) but also never made much use of those skills. GW, LOTRO, EQ, Champions Online, DCU... I tried them all and none have really even bothered to approach the topic.
I read once that SW:TOR was doing something similar (if someone in the party had enough points in hacking or something they could hack into a terminal and open up a new path for the party to take, offering more loot than otherwise attainable), but apparently this concept was never made into anything significant either.
I want to offer more than just battle-based things like damage, healing, or CC. I want to build an ice bridge so our party can cross this obstacle and keep fighting. Haven't been able to do that in an MMO yet.
So now here I am. I figured that if any community would have the collective knowledge large enough to know what I'm searching for, it would be PA.
I'd love any suggestions!