I have to agree with you on the getaway scene. The nerd overplays his lack of coordination. The angry boss predictably gets within a fingernail of catching the moped when the nerd finally starts it, only to lay it down riding side saddle in the rain. This gives the boss time to get close again. The nerd actor was obviously trying to fail at getting on the moped. It was almost funny instead of suspenseful. The nerd was terribly awkward and continually making bad decisions.
But aside from all that, I found the plot interesting. It was not all that surprising but it kept my attention.
The final scene was not done well I thought. I think it was supposed to convey the idea that the nerd was thinking of all the times he had bought himself trouble by looking in windows at people, and deciding he should quit? Not sure about that, it was hard to know for sure.
I kind of liked the film though.