Ive never really got why people have so much hate for them. Sure there not great, but I'm not going to watch a Transformers expecting to come out of the theatre a better person. I want to watch robots shoot at each other. I really think people just hate Michael Bay because the internet says too.
The second one definatly had some problems. Take into account part of it was written by Bay himself because of the writter strike, and Shia LeBeef also was in a pretty serious car wreck while shooting.