I too thought all the Klingon blast did was sting the God-thing long enough for Kirk to beam off the planet where it's prison would render it harmless.
In that respect it did just as much damage as the nuke did to the hippy eating thing in Quatermass (1979).
Dracula 2000 is no classic but it's not that bad, in fact I'd put it on par with Waterworld which while nowhere as bad as it's often made out to be but is still bad.
I find Star Trek V to be as watchable as Star Trek IV but more easy to listen to because the music for The Voyage Homo is utter bilge.