Well, I know there are folks out there who like Angel Season 1, but I certainly wasn't one of them. I had never seen an episode of Buffy when Angel debuted, but I watched Angel from episode one 'cause my girlfriend at the time had gone to college with Liz Rohm (they were both theater majors). I thought the show sucked. I hated Cordelia (now, of course, I love her), I thought "vamp face" was a lame take on vampire appearance (vampires are supposed to look COOL damnit!); the whole vibe of the show seemed forced and sort of underwhelming. I kept comparing it unfavorably to Kindred: The Embraced, which I thought was a great show. I stopped watching Angel after nine or ten episodes, and didn't watch it again until about six months ago.
After discovering Buffy I have a much greater appreciation for Angel (and Season 2 is so much better than season 1), but I don't think it could ever have drawn in a large enough audience as a self contained piece.