Circle is not as powerful as the old Wail, but it is almost as powerful as the pre-U17 Wail. Circle is a 6th level spell and Wail 9th level. IMHO, Wail is weak enough to be a 9th level spell (in my opinion needs a buff) But at least soon will work. Currently not kill anything, it is completely unreliable.
I hope they fix implosion, yes. Divines need more useful spells, not less. I also would like new spells for divines martially oriented. The spell compendium 3.5 has some spells that could help a lot to ddo divines. But ok, this is a thread about Wail, not about new spells (arcane list is tiny too, too many schools almost empty- illusion, for example...)