Same here. I actually made it through 2 seasons because I heard from so many it was amazing but I just couldn't get into it.
I hate to be that guy, but IASIP doesn't truly start to become IASIP before season 3. That doesn't mean that the first two seasons aren't funny though. If you didn't like season 2
at all then it was probably smart to stop.
Season 1 -> completely different show.
Season 2 -> you start to see the beginnings of what the show will become
Season 3 -> the spirit of IASIP is fully there, but there are big rooms for improvement
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Season 4 to Season 11 (!) -> Peak comedy. Cannot be topped.
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Season 12 -> some worrying signs, but still funny.
Season 13 and up until now -> clear drop in quality, but still the occasional funny episode.