Clerics seem damn rare, but after having leveled mine to 7 I can easily say that they're damn boring .. unless you love sitting on your ass, healing and spending the rest of your time checking reddit.com and socialising in /group and /gu. Though opinions might differ on this one
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If you have a buddy you'll be playing a lot with, a cleric/whatever duo would do wonders. You get heals, buffs, (good undead) nukes and lull to get single pulls. He can be a tank, dps or a caster with a pet and you'll be rocking. If not, I'd avoid the cleric unless you have a lot of friends you can group with from time to time. Solo life as a cleric will drive you nuts.