I recall the first season being pretty doggone interesting at the time. Very different from everything else on TV. I recall the second season being a dud.
What I've found when watching old shows again (X-Files is the most recent) is that they don't hold up well against modern television shows, which have used them as a springboard to improve the state of the art. I've avoided watching Twin Peaks a second time for that reason, figuring I'd stick with the incredibly good memory of Sherilyn Fenn tying a cherry stem with her tongue instead of seeing it a second time and not being impressed by her "pacing" or some such.