See my notes below:
1. Giants knocking you back when they miss and hit with swords. Sorry this just goofy, if they or going knock you back a barb using any weapons should be knocking them back with a 50 strength. It adds no fun to playing just a constant pushing your keyboard to get back in mêlée range.
I do not see this as an issue. A giant no matter how strong a barbarian is would be almost impossible to knock back. While a really strong barbarian might have a strength of 50 buffed up a strength of 50 for a giant would be low by DDO standards. While the barbarian might get close to the strength of a weak giant he will never get close to his weight. This feature seems appropriate to me.
2. The changes to old raids, sorry if they are old they should be getting beat easy that the point of old raids. To go back and fudge around with, that what I get replay value from. Fix the bugs stop changing old raids to challenge the new higher lvl players. Sorry never seen a game do this before and hate it.
I also do not see a problem with developers going back and tweaking older quests or raids. To me a developer that did not do this would be a bad developer.
3. Air ele's just plan and simple annoying, after the novelty wears off this buggers or just plain and simple annoying.
I agree that air elementals can be annoying however if you have a well balanced party air elementals are really no problem at all as they can be better dealt with. I see the issue as some players wantng to have their particular class choice be able to beat all dungeons by themselves. This is not the intent of D&D.
4. The new quest really way to much on evasion, even though my main a ranger which does not bother me much. It's just stupid sorry. Come up with new attacks stop using cheesy tactics. Yes, I know there players that use cheesy tactics, but think you should stop worring about them, but instead the bigger picture. Not a few hand full of players. (Oh yeah hate puzzles to beat down critters, making them stupidly tough to complete puzzles to win, Woot. Even though think can kill him by kitting) By the way I do love puzzles, but there time and place for them.
No real comment on this point although I agree, I don't like players that try to exploit a dungeon. It is more fun to complete a quest the way it was intended to be played
5. Its the fun factor you have been missing, grinds that or fun and not to extreme work, what you have been missing in mods lately.