I never saw Transporter 1, but hubby had the remote when this was about to come on and, to be fair, nothing else looked the slightest bit tempting, so I watched the first few minutes. It was so silly and unbelievable that I kept watching.
I justified my continued interest by wanting to know why the bad guys wanted the little boy and what they wanted to inject him with. By the time I had the story figured out I was hooked by the vast amount of suspension of disbelief required and the total stupidity of the whole thing, but I watched it right up until the final credits and enjoyed it for the nonsense it was.