Holy crap! Go read this and come back: Shock and awe in the Arena - WOW Insider.
My shaman just recently dinged 70, and I've been planning on giving enhancement spec a good solid try. I've been getting my face smashed in over and over and over while I "pvp" for some season 2 gear. Now, I've got second thoughts... if you didn't go read that post on WoWInsider, watch the video here.
Shock and awe is Right!
Watching this video, and even though he's multi-boxing, it's easy to see the key to winning a 5v5 is communications and coordination. Obviously, this is the epitome of synchronization and timing. Imagine lightening bolts and chain lightening times 4 (maybe more is overload procs) smashing you in the face at nearly exactly the same time! That's simply insane! Hats off to the guy for being able to pull this off.
Now, I just may need to respec my Shaman to elemental and give it a go. On another note, after I'm done with the 29 Mage Twink PvP Guide, I'll be writing up a few other guides. One being about the Shaman/BM Hunter 2v2 comp. Stay tuned!