Originally Posted by
Cortano
I disagree; you can be very competitive with both by just min/maxxing your talent picks. In particular, a pure tank build can get within 5-6% of the DPS of a pure-cat build. Obviously, you need to swap out some glyphs (but glyphs are the new flasks), and your gear needs to be appropriate... but there is nothing in the talent spec that stops you now. It will be even easier in cataclysm, when there will be more "fluff points" to make your spec more enjoyable.
However:
With the advent of dual-spec, it doesn't matter anymore. Why bother cramming two roles into one spec, when you can just respec and pick up that extra couple percent effectiveness? Most classes only have two roles anyway, what used to be a huge cause for jealousy is now irrelevant.