I think some people view this forum as a place to vent their frustrations about the show and see if anyone else is feeling the same way that they are. Sometimes, I think people take it too far and viciously attack the characters (and people who like those characters) and the show with nothing to back it up but personal opinion. This is just a place to have fun. Angry people aren't fun and I think people should try to lighten up. After all, it's just a TV show.
Regarding my personal feelings, I would not say that any episode in S4 has been particularly bad, but there's something missing. I think the lack of character development, S/V development, and plot development was a result of the network asking JJ to make self-contained episodes to draw in new viewers. I understand that and I do know that the good stuff is coming (probably starting tomorrow night). So when people say that Alias isn't Alias anymore, I can partially agree with that but I think it's about to return to it's previous form.
I also think another problem was that they switched up the order of the episodes. S/V has been slow going (understandably given S3), but I think airing Liberty Village out of order was a bad idea because people expected to S/V back in full swing and that hasn't been the case. But I have no doubt that things will be sorted out when the episodes start airing in the original order.