Ummm yeah, I mean the thing people rip S1 for the most was Aincrad being rushed with massive time skips and then stopping before hitting level 100. Though oddly.... despite being rushed some of the episodes feel a lot like filler, so I can see why it would bore some people.
Alfheim gets ripped for turning Asuna into a damsel in distress, the lack of stakes in the virtual world where no one actually dies anymore, and all the rape and incest.