A lot of people bash MP2 for being short but I don't think it is. Took me a good 2 weeks to complete, and has incredible attention to detail. I spent over an hour on the Police Station level alone, so many Easter eggs taking the mick out of 3DR / DNF, the names of the characters, listening into conversations, the lines the guy on the toilet comes out with etc. Even posters on the walls often had a subtlety to them. I really think some people must have missed out big style when playing MP2, half the gags and little touches probably went straight over their heads, or were bypassed altogether.
One word of advice to people playing the game - don't rush it.