What the movie has going for it is the entire original cast returning. It is a good follow up film to the original, as a stand alone film I don't think it would hold up on its own. It relies on reusing gags from the original film in new ways and needs that connection to the original to work. I don't think it will stand the test of time like the original has, the cast does reprise their roles well except John Corbett phoned in his performance in my opinion. It was funny, the story line though just kinda of got a little sloppy with the daughter going to school and the parents wedding it felt like an excuse to make a second one. Its a sequel we did not need but can watch and rediscover what made the first one so great.
Source: http://www.huludb.com/movies/228668-my-big-fat-greek-wedding-2
Source: http://www.huludb.com/movies/228668-my-big-fat-greek-wedding-2