I give up playing a Paladin Protection Tank, I can't hold or keep aggro anymore and when a DK Frost out tanks me in the dungeons I'm Surrendering I was almost all geared up to tank ICC and what other dungeons that may come not anymore my run through ICC is now a pipe dream I'll probably never see. Had a DK Frost tell me he's loving the tanking now its so easy with his DK and the warriors are now even better at tanking and he was so happy people stopped making Paladins it tickled him pink as he puts it paladins are over rated and needed a big time nerf so the other classes could shine.
So out of my fustration instead of quiting WoW I rolled up a mage who know's I may yet quit WoW someday but not today I'm just a minority in this and Blizzard doesn't listen to the minority. It is as it is but I won't be getting the expansion till maybe summer when I can afford to spend $40 dollars + tax on something.
<Steps off soap box>
If your point was simply to rant, I guess your mission's accomplished.
If you were looking for advice or reasonable discussion, your delivery was off. In the spirit of being helpful though, here's my two cents -
The problem's not the class, it's your timing; you'd be having the same problem if you were just now trying to gear up a warrior, druid, or DK tank. There's a huge gear gap to bridge. You could get away with being carried as an undergeared DPS, and to a lesser extent healer, but it's tough to be an undergeared tank when your DPS is sporting t10.
Take a deep breath, relax, and realize that gear's going to be reset in a couple of weeks. If you want to keep tanking, start planning ahead now and be ready when Cataclysm launches.