Ok, so the first movie is a cult classic and the second movies only saving grace was the hottie who spent 95% of the movie naked, but I gotta be honest here...apart from the crap acting and the sub par special affects I actually found the ST3 quite enjoyable.
Ok, it was a million miles from the class of the first movie BUT if your only baseline was the second movie then number three is pretty damned good.
One of the surprising highlights was the Holy chick. Loved the "kill him, its the wrong god" line
And it did bring some new twists to the original story, with the brain bug playing a role and that planet sized bug who the air marshall thought was god.
All in all, not a bad movie if you can put aside all the poor acting.
Regards
Mailman