No dash dancing and increased landing lag aren't glitches and could be seen as completely intentional design decisions.
The only thing that we're not sure about that people aren't complaining as much about are the broken DI and crouch cancelling.
But bowser for some strange reason can actually crouch cancel, so we have no idea if it's something they were in the process of adding to characters or just an error in bowser that they're going to remove, so you see less complaining about that just because people are confused about what is happening.
Note that I'm not talking about his moveset though, which I'm assuming is what you were meaning, just the way he transitioned to brawl.
I want his moveset to stay mostly the same because I love it, the only thing I want is a different recovery, global changes like the crouch cancelling, reduced landing lag and dash dancing and for them to let you cancel his flame choke into an up throw instead of making it something that can always let your opponent force you to SD instead of recover.