If you mean the TV show, not hot, because I think the guy who plays Bill is unattractive (sideburns? seriously?) and they totally removed all personality from Eric's character.
If you mean the books, hot, but only because anything Eric (BOOK Eric, that is--the one with a personality) is hot.
And also because of the issues between Eric and Bill that are just oh so...
Well, you'll have to read the books to find out (which you should. Sorry, but Trueblood the TV show is boring.)