You know, I always was frustrated with and resented Angel because I saw it as a show that was approaching the same themes as Xena but not as well, and it irked me that it got acclaim for being "mature", because it felt so adolescent and self-indulgent by comparison. But Gunn was the exception. I started with Season 5 (having run out of Buffy), and Gunn's Season 5 arc in which he was almost the only member of Angel Investigations to give the W&H experiment a serious try was the best thing about that season. Going back and watching Season 1-4 cemented him as my favorite character, with the most interesting storyline. If you haven't seen it already, I recommend Sunset Boulevard, by butterfly, a Gunn character study that is hands down my favorite AtS vid, and the sort of vid I want to make someday.