I'm not quite sure how to answer.
I was definitely more of a Negatron, and a LOT of the things that I thought would be bad in the TF movie were indeed bad. However, I was more entertained by the action and FX than I expected. So yes, I was wrong in thinking that I wouldn't like the film, because overall I did like it. However, I was right about the lame gags, bad acting and holey plot. I still say that the robot designs are too "busy" and confusing at points, but they still looked cool onscreen.
So I was wrong on maybe about 40% of the things I was expecting to suck. I was expecting a 4/10 movie and I got a 7.5/10 movie.