Disregarding the fact that you'll probably be vs'ing people with no gear at all at the moment.
Enhancement Shamans in WotlK were quite hit and miss, they can absolutely murder cloths, mages especially, but it can be pure luck depending on your build (Crit WF build is legit as **** though, One hit kill anyone but a bear if they proc :D)
Enhancement Shamans in Cata were actually really good, having quite a few more tools at their disposal, but most of all their survivability went up 10 fold cause of maelstrom procs, and their 4 second(IIRC?...) wind shear is a god tier interrupt.
IMO, I enjoyed them in WotlK due to their randomness with specific builds, but I wouldn't say they're amazing, Cata made them strong as balls, and if you like pressing buttons it's quite a fun class, but if you're squeemish about playing on really low health I wouldn't bother, the amount of duels I've won being at 10% and not dieing for a minute or so are too many to count.
But as said, at the moment with no one being fully gear'd (or very little) you'll pretty much just one hit anyone anyway.