I could care less what people on here think man. you might not find yourself in a core 10m group, but i'm pretty sure you could easily find a 25m group that's just right for you and don't let other peoples opinions hold you back. If you're set on Enh and raiding in WoTLk, then you need to be prepared to give a little to, so pretty much just give up on the idea of 10m groups, it'd be easier on you and everyone else if you just found a nice quite 25m raiding guild. You might not top the charts, but you sure could hang in the middle and meet the required dps to stay in the raid.
Anyways, good luck man and stick with it, don't let some opinions on the forums stop you from getting what you want.