My feedback for your feedback:

Floor 1: I agree with the first boss being too easy. Although rather than just upping the DPS required I felt that it should have more mechanics that needed to be dealt with, as a DPS I found it boring to whack at it until it died. I'm guessing this is just Savage mode with most mechanics being removed. The DPS check for the Oppressor fight is easy as is, have had no trouble with it with both Duty Finder and Party Finder, so I can't comment on that. As for the shared HP pool, one of the mechanics is needing to kill them within 10-15 seconds of each other, which is easy enough so I don't see the point in a shared HP pool.

Floor 2: The remaining waves UI thing would be pretty cool, not necessary but then again most things aren't.

Floor 3: DPS check? Ran this far more than Floor 1, and I can safely say that most groups will do this without problems. It shouldn't be nerfed to the point that someone can click 1-2-3 and beat it. The boss does overstay its welcome though.

Don't really have anything to comment on with floor 4, only ran that a few times.