Not the best episode of 2 1/2 Men, it just was a weak episode overall, and Alan was just plain annoying. This episode wasn't very funny, the only part I found myself laughing at is when Jake asked Charlie if he was drunk.
Also it was an interesting method, the prettiest and most popular girl is the most lonely. But overall, this was just an unfunny installment with not much to offer other than Alan whining throughout the entire thing.
A good twist with Charlie actually trying to get rid of his girlfriend, but it definitely wasn't enough to salvage this episode as a whole.