In a Euro party, Clerics are more or less essential. Granted, you don't have to have a Cleric, but their buffs and healing make things a hell of a lot easier; Wizards can focus on killing, Warlocks can focus on debuffing, and the entire party can have just a big old grand time instead of constantly worrying about getting killed.
Their buffs, such as the ones that add STR and INT are also certainly helpful, not to mention that Clerics have the single most hard-hitting nuke in the game - Offering and Pure Offering.
So yes, for Euro's, because of their pot delay, I'd say that they are neccessary. Chinese, however, do not need Clerics as much. Still, a Chinese character + Cleric buffs = a killfest.
As far as my personal opinion about the most flashy skill goes, my vote would have to go with Bladers. If you haven't seen them PvP, their Heaven Chain and Ascension Chain is pure love. Sure, Wizards have meteors falling out of the sky, and Warlocks have their cool red skills, but nothing beats the old-school, badass Pure STR Blader.
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