But based on comments on this thread, maybe I'll finish it.
What I liked:
--I thought the original hitman was perfect, exactly like what you'd think a hitman would look and act like. The professor who replaces him sees he has a conundrum: he has to change his appearance to match his client's expectations. His professorial appearance just doesn't cut it: too humdrum.
I liked the various portrayals of hit men that he came up with. There was the sort of sleazy guy in the suit and then the character with the straight hair and who talked a gory scene with the client. This must have been great fun for an actor.
Oh, and the most fun part was to see the person hiring the hit man on the lineup wall. Their expressions were priceless. There was a good deal of character choices with this part of the film.
Another character I really, really liked is the female boss of the unit. Again, creative, realistic character choice. In many ways, I think she may be the best actor in the whole film, and that's saying something because the male lead is really, really good.
I liked how this female boss handled knowing that he let her off and guided her out of the decision to hire the hitman. I think it is completely reasonable to understand that sometimes people are pushed to do stupid things and that they may be desperate and might even change their minds the next day. Recognizing that she was one of them and did not deserve to go through the legal process seemed reasonable to me.
What I didn't like and where I lost interest:
The lover discussions. Bleh. The sex scenes were pretty good, though. Every time she opened her mouth about why she wanted to hire the hitman or how she handled issues with her spouse, I just wanted to say shut up. What a bore. And who cares.
It was actually at this point that I turned the show off and decided not to finish it.
The scene where she was dressed up as the airline pilot was kind of cute, and the puns were good.