The Lost Boys: The Thirst (2010). Watched the listed movie a few nights ago. To start, I must say that to me it was better than Lost Boys: The Tribe (2008). Either they had a little bit bigger of a budget or they decided to make a graphically better movie. I'm not saying it was hugely better...just better.
They upped the ante by adding a few shots of boobies and made the death of the vampires more Blade-like where they sort of explode in ember ash. Zoe and Gwen are pretty hot additions but they weren't utilized quite enough or properly, in my opinion.
The acting still was somewhat sub par. The story line slightly week. The lame attempts to appeal to the fans with flashbacks to Sam and the Frog Brothers in the original movie. The lame voice of Edgar Frog trying to be more fierce than he really is (that's not the way he was in the original). They sort of took themselves [the Frogs] too seriously.
To keep from rambling on, I'd say if you are a fan then it's sort of a requirement to continue viewing the sequels no matter how bad they might be. If you aren't a fan, then I'd say you could find someone to clip the pieces together of the hot and sometimes naked chicks. It would be more worth your time and effort than watching the entire movie.