Graphics, characters, monsters and play-style are so polished, it also provides a long time gaming experience with its' upcoming expansions, dlcs and many more.
I wouldn't say there is a solo mode as well. Because you should not really play solo mode in this. Like any other multiplayer battle games, it is more exciting playing with others. I also really like its' matchmaking which doesn't take so long.
Evolve could be described as '1 big bad ass monster versus 4 amazing classes in a such breathtaking environment with full of surprises'.