Zardnaar
Legend
War Cleric doesn't really geat extra attacks regularly; the number of those is tied to his Wis modifier per long rest. If you're running 4-6 encounters a day, that's 1 extra attack per battle on average (assuming Wis20). Even less for a more intensive day. I don't think that makes War Cleric any more powerful than what certain other features grant clerics of different domains.
Its also his short rest channel divinity combo with great weapon style. +5 to hit, +10 damage or they use bless to help negate the -5 part and swing away. The war cleric is a lot better at fighting than all the other clerics even though one like the tempest also has heavy armour+martial weapon. Having a war cleric+light cleric and have them using bless+faerie fire combo gets funny as well. Bless is better than the tempest/light cleric blaster spells.
Channel divinity is also the reason the light cleric is the best blaster out of the clerics, it is absurd at lower levels.