Their more exciting fights are on the prelims rather than the main card. Main reason for that is because their biggest names are blankets (Jake Shields, Will Brooks, Andre Harrison, Luiz Firmino, Jared Rosholt, etc.). Even then, the fights where they lose or get their ass kicked are pretty fun. (Shields vs Cooper, Tiller vs Rosholt, both of Halsey's fights). If you only watched Harrison's and Brooks' fights, then I don't blame you for that opinion.
There have been some good fights on pretty much every PFL card so far. Some WSOF cards from 2015-16 were stacked with absolutely boring fights. Especially the ones in the Bantamweight and Welterweight divisions. Well, besides the Marlon Moraes fights, anyways.