LeadGentleman
Rogue Demon Hunter
I had a look around and I couldn't find a favourite season poll, so I decided to make one.
Tranquillity
nice demons!
Season 5, no contest!
To be honest, most Angel seasons had some long rough patches where they were just boring. Season 1 was pretty dull. Season 2 was decent until Darla showed up. Season 3 was great until Holtz came along. Season 4 was far too Connor-centric, and Evil Cordelia was the worst thing that ever happened to Angel.
Season 5 was never boring. Every episode was great(with the possible exception of The Cautionary Tale of Numero Cinco, which was just okay). Spike was a great addition to the cast. Also, it had a lot of the most memorable episodes (I loved A Hole In the World too much for my own good.) It was the only Angel season that I liked more than a few seasons of Buffy, and that's saying something.