I mean, it's not the worse plot. The nice guy is in love with the hot artsy girl that is engaged to the douchebag. It's something a lot of people can relate too. It's just after they got together there was no drama left. Yeah they had Michael and Holly but that wasn't anywhere near as dramatic.
They just never really had that much chemistry. Like it felt like they were forced to like each other for the sake of the show. It's not like Ross and Rachel who felt like a real couple.