Come on man, can't draw conclusions based on this one game. Check his armory:

The guy is in quest gear (greens and blues, not a single pvp item).
This was his first arena ever on his shamans (and the only one apparently)

http://us.battle.net/wow/en/characte...atistic#21:152
http://us.battle.net/wow/en/characte...atistic#21:152
http://us.battle.net/wow/en/characte...atistic#21:152
http://us.battle.net/wow/en/characte...atistic#21:152
http://us.battle.net/wow/en/characte...atistic#21:152

Ele's are in a really poor pvp state since 5.1 (not that they were that good in 5.0), but it's a bit too easy to use this as a reference to state why you don't play ele shamans.
Call me mister negative, but that's how I see it.