The problem with all that is they assign you pre-made characters, so the Thor you're fighting with isn't the Thor in your roster.
Thanks for clearing that up. I couldn't understand how they were matching me up with opponents. Either they were way too powerful or so weak I'd win matches with very little damage. This isn't a good way to run the matches. What if three people with level 80 characters played three fights and stopped? Everybody after them would win two fights then get slaughtered, and those powerful enough to survive wouldn't have anyone to match up against after breaking through.
While I do like the challenges and PvP, they need to develop a better system for matching teams.