As well as damage sponge enemies and constant arena battles. Like I said, in 2D games, if they aren't arcade brawlers(with the tilted ground that allows walking in multiple directions, like Double Dragon, TMNT, Final Fight and such), locking in characters should NEVER be an issue. There should be no arena sections unless for two exceptions:
1. Boss rooms.
2. Elevator/lift sections(some Mega Man games, as well as Splatterhouse, among others, do this).
THAT should be a rule!
I completely agree with this. I got totally bored when I got stuck in a full 2D room until I defeat everything in there.
That did not prevent me from enjoying certain games, but I would change that right away if it depended on me.