Good grief, here we go again. More of the tired "if it is so bad then how did it make so much money" garbage we hear from gangsta rappers and reality show producers. If you like Transformers 2, fine. Go ahead and tell the world if it means that much to you. Just remember that there are a lot of other people who don't like it and who are equally entitled to their opinion.
I would recommend you to watch Battlefield Earth (2000), Freddy Got Fingered (2001), Swept Away (2002), Feardotcom (2002), Dirty Love (2005), and I Know Who Killed Me (2007), then tell me your rating out of 5 stars what you thought about each one.
Granted, those are all terrible movies. However, you are trying to use the classic "putting a pile of crap against a bigger pile of crap so the smaller pile of crap won't look so bad" argument. Putting those movies against Transformers 2 does not change my opinion. An awful movie is an awful movie.
lol. I guess "quality" means "what Marco S. says is so." Have a little confidence; if you didn't like it, recognize the subjective nature of that. You sound like my 5-year-old nephew: "I hate Cap'n'Cruch 'cause Cap'n'Crunch sucks!!!! Waaaaaa!!"