Spriests, Rets, Ferals, Balance, Eles, Enhs and Windwalkers generally bring more dispel-like effects (root breaks or the like) and some off-healing.
Mages, Locks, Rogues, and Hunters have the most control in the game.
Warriors and DKs are some of the hardest specs in the game to control, but are susceptible to roots.
Sustained damage is actually quite balanced across the board - burst damage however varies, but not to a huge degree: and not always in favour of hybrids, take a look:
Rets, Ferals, Balance, Eles, Enhs, Windwalkers, Unholy DKs and Warriors all have burst windows every 2-3 minutes that are very dangerous, but rare (2-3 minutes).
Spriests and Affliction Locks don't really have burst windows like anyone else - ours are significantly weaker, so that our damage is more like a Sine wave based on Shadow Orbs or Soul Shards. This is both good and bad, since pressure isn't all that relevant nowadays - and burst is pretty much everything.
Mages, Rogues, Hunters, Destro and Demo Locks all burst quite hard - and they do it every 1 minute or less, not the 2-3 minute cycles that the other classes have. Shadowdance up until the Find Weakness nerf was comparable to the 2-3 minute cooldowns of the other hybrids, except it was once a minute - Beastial Wrath is just the same. Locks work a little differently, but dropping a couple Chaos Bolts or Waves on people once a minute was comparable burst to an Avatar'd warrior or an Ascended shaman (apart from the CB double-resil bug).
Every 30 seconds a frost mage can burst at least as hard as any spriest or afflock can every 2-3 minutes (Dark Soul/Shadowfiend): and fmage burst is much harder to counter than interrupting Insanity or DS-Malefic Grasp. Every minute an Fmage can burst as hard as the 2-3 minute cooldowns of the other hybrids.
So to say that hybrid burst damage is high is a bit of a misnomer when we don't account for the frequency of burst. Similarly, to say that hybrid utility is high - when pure control (a form of utility) is way higher than hybrid, is also pretty bizarre.
Lastly, pures in MoP are almost never the kill targets for the enemy teams - it's only when you fight a double-pure team like MLS or Thugcleave that people want to kill a pure target: Pure survivability is notably better than many hybrids (ignoring rogues pre-5.2, because rogues didn't exist at that time).
I would like to see a radical re-design of a number of the more popular hybrid specs though, and I've started work on such an idea for Shadow (with hints at other specs) over in the Priest forums - but I don't think it's ready yet for major public scrutiny. Briefly, I would like to push some hybrids toward non-healing support, other hybrids toward healing-support, and pures toward burst damage - with control mostly divided amongst them all evenly - but instant CCs mostly removed.
Edit:
Here's that thread if you are interested Lulbalance
Still a very rough draft, but particularly the intro should help show where I think the idea could go: I basically want more specialized roles, especcially within the very broad "support" category (since that seems to include all specs nowadays).