I can't speak for everyone, but my opinion is no. There seems to be a lot of QQ about shaman DPS being low, by bad players. I solo an elemental shaman, and ran through BT and portions of SWP pre 3.0 and post 3.0, and noticed only one difference. My DPS went up. I went from about 1300 in T6, to 1700 (And topping the charts) post 3.0. I can't speak for level 80 yet, but I predict the same results roughly. My DPS was always high, and with the ability to bring totems to the game, the occasional chain heal spam if things go wrong, I don't see how you could hurt your raids DPS, or hurt your raid overall.

I can say even my low geared (800 spellpower) 5 shaman team was able to pull 1000-1200 DPS on SWP level content (Post 3.0). I think with the right gear you will be fine.