I love season 1. Every episode and the entire season as a whole.
They kinda lost me halfway through season 2. It was still funny enough, but season 1 was lightning in a bottle. It was exactly the right ratio of sentimental, dark, optimistic, crass, and surreal. S2 kinda jerked around with it. And I don't even blame them. How do you continue the story past S1 besides for either putting ryan in a mental ward (but for real) or showing him dead his couch holding his suicide note.
There wasn't really a third option. But Wilfred (the guy in the dog suit) is still funny as shit.