ThisI'm in a number of random leagues on nfl and the interface is pretty scrappy. Lots of features are damn near impossible to find and player movement is a hassle. Yahoo outperforms it. No comment on any other engine.
Currently a commish on NFL and it's a pain to find basic features
I struggled to find waiver claims the other day in their new interface
Imo CBS > Yahoo > NFL > ESPN
Only nice thing about NFL is people who do their research get rewarded with ez draft picks (which is me)