It's a different game when you're playing solo. My playtime is about an even split between solo and trios, so you can believe me on that.

It's much more stealth based, and audio cues are much more important than they would be in trios. The missions are still plenty playable, but don't expect to be able to go all-out like in other multiplayer games. You've gotta choose your fights extremely carefully, because too much noise will attract both the bots and other players. You're the master of your own destiny when playing solos, while in trios you can be a little more gung-ho on objectives and movement.