Finally got to try a lobby with three people. Spectating works great and there was no lag with the players I was with. You actually have to toggle spectating on, however, which I found stupid.
I'm getting completely annihilated in most matches (get me a corner and I'm done), but learning a lot and finding who I want to stick with. Although he feels stiff and slow, I am liking Ghost Rider. Was able to shut down a lot of long range stuff with his normals, especially crouching H. Also am having fun with Rocket Raccoon and Nova. I think the only new characters I don't care for so far are Dr. Strange and Nemesis, although that's just from messing with them in training and not from seeing them in action.
Have already seen some amazing Vergil and Firebrand stuff.