The first few seasons were great - I would rate them 8/10, but my goodness is it let down by most of season 4 and season 5.
Season 5 is just painful to watch. The plot lines they've concocted feels so disjointed from the first 3 seasons and gives the show a completely different vibe. I think the problem is they tried so hard to hold on to the original cast that they came up with these wacky subplots to keep them relevant.
It just doesn't work and make any sense. And don't get me started on Popes character development - totally thrown out the window. Ended up disliking pretty much all of the main characters in the end. A shame.