"Doubt" gets too caught up in the Bruce stuff that the eventual conclusion, Bruce seemingly disappearing into thin air, didn't live up to expectations. The episode has funny moments--Wilfred's gangsta swagger--but they are put off to the side once as Bruce shows up and confirms to Ryan that Wilfred is a bad influence. It all seemed like it would build to something big, when we'd learn all about Wilfred and Ryan would have to make a choice. But Bruce is gone and Ryan left back where he started, smoking with Wilfred. In the end, nothing really happened.
I don't think plot is too important on Wilfred, but when the writers dangle out bait, I want to get something out of it. Instead, they remind us that Wilfred and Ryan have this weird relationship--not positive but not entirely negative either--and we learn nothing else.
Score: 8.5/10