Going for achievements is pretty much the only thing you'd really need a pure survival for, asides from the fact that Blizzard have monumentally well and truly fokked up WOTLK raid instances, especially on 25man content with the whole WG/Instance lag issue.
More and more often I see and experience tank deaths due to the inability of healers to be capable of getting a heal off, or I see healers ganked as tanks are unable to generate threat with such diabolically performing game servers.
Would I change my gear specifically to compensate? No I expect Blizzard to provide what myself and millions of customers are paying for.
Is it worth gemming/enchanting new gear to compensate with an eye on new content and new difficulty levels? Yes, quite probably, given the added 9g a pop repair bills, you'll need the cash for that rather than regemming/enchanting later.
Bottom line is can you cope with what you have? if so, don't worry, or use the other three sets of legs or chests for different setups given none have all the stats you want. My hit is low too, but I dropped some dodge for expertise, and dropped another TP from dodge to added rage so it can be compensated through.
Former TBC/LK Tank
Waiting for Dunmail Jnr to sleep to enable online gaming.