Warriors are straight up brick walls when alone, have the ability to entirely negate a spell (reflect) or two (mass) in addition to a melee ability (intervene) multiple times per minute. Demo banner and Rallying Cry are pretty awesome as well. If they talent into it they can also root anyone they've hamstrung.
WW Monks have massive self healing, Freedoms and most importantly, Zen Med versus spell casters.
Rogues have Smoke Bomb and the ability to CC multiple people multiple times every minute.
DK's have Death Grip.
Enhancement Shaman have Healing Tide Totem and, if talented, Earth Grab Totem root every 25s... I guess Grounding counts, if we're pretending a Mage won't just Ice Lance it away?
Ret Palas have a fair amount of utility but only predictable and avoidable pressure.
Ferals have Cyclone, Roots and a ton of off-target pressure via strongly buffed bleeds. They also have Typhoon which is annoying to no fucking end.
Overall, Warriors are hands-down the most well-suited melee while Rets are probably the worst as they really aren't able to put out the pressure even a DK can.
Its been this way for a long time the only time a melee is good is when they are op. Unless you have a melee like warriors which are 5/5 in everything Mobility, survival, control/utility, burst dmg, sustained dmg and spread dmg. If you look at the other melee they will be good at some of those but never all of those.
If you want to go a melee go warrior almost everything else sucks overall. And top it off warriors are the near the easiest to class to play. Wod may change this but that's not for another 6-8 months...
Since 5.4/s14 melee have become quite mobile and very good at keeping casters pinned. Some do exceptionally well such as monks, rogues and warriors but others arent terribly bad with ret bringing up the rear. So melee have a very strong presence now and can be quite useful for warlock like me as they can engage quick and last while I setup gates and tele (very hard with only casters/ranged sometimes).
If you're thinking long term on deciding which class to play, I'd wait until beta to at least get a clearer idea of what direction they are going as the mobility/gap generators are undergoing lots of changes and even though everything is subject (and does a lot) to change during beta, it'll be much easier to determine what melee will be like in general in WoD.