Only the last season of Angel was in HD, and even then it was only in 720p HD, not 1080p FHD, but it still looks better. Every other one was in SD (480p)
The refresh rate wasn't fixable in this video, as the first intro sequence was at 29.97 FPS, whereas every other intro sequence after that was at 23.978 FPS. The first episode of Angel appears to only be in 4:3 mode, which is bizarre, because it looks like the source footage they would have back at the station in 1999 would have to be in 16:9 (or something similar), as the intros after this use the same footage, and how the episodes linking the source footage for the intro sequence together might suggest, it looks like they might have recorded the first episode (the "pilot"), but didn't make an intro yet, then filmed a few more episodes, then made an intro sequence, and then retroactively putting that new intro on the first 5 episodes that didn't already have one. You follow? Probably not, it's a mess to explain.
Basically, season 1 of Angel is full of anomalies, in the first 5 or 6 episodes, at least.

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