The first movie is a classic - Although a gross out comedy, the film also has heart and somehow manages to maintain a 'feel good' vibe through out. Some hilarious scenes, and lots of laugh out loud moments.
The second was still very good, but couldn't match the first.
The wedding? I remember being disappointed at the time, and didn't enjoy it that much - Stifler is reduced to a pantomine gimmick, many of the original cast didn't return for the wedding, and Kevin (who had a main role in the first movie) is reduced to a supporting role with about two lines in the whole film.
Band Camp? Okish I suppose but pretty crap in comparison.
The naked mile? Much worse, and pretty poor.
Beta house? Absolutely dismal - Pure tripe - The brand has been reduced to a low budget porn comedy and lost everything that was good about the originals.
Not gonna bother with 'The book of love' which is the newest one.