Pretty sure beating the game in about 5 hours gametime is part of gettin some secret weapon or skin in the game.
When it comes to cutscene/playtime stuff: you should only worry about playtime being low if you're rushing at insane speeds and already pro at the game. The annoying part of the cutscnes (which are skippable) is the fact that they're probably the reason why the game needs to install each "chapter" as you play everytime you start it up. Each install takes about 1-3 mins. They also seem to add a few extra seconds of loading time here n there. Still though, I loved the campaign and this is the first MGS I ever played/owned. I went through it several times to collect and unlock random stuff.
The online definitely isn't very popular at all. It's way different from pretty much every shooter out there (whether its in a good or bad way depends on you). The learning curve is also pretty steep. I have one friend who's actually hooked on it though.....it was funny seeing him on my lvl0 account murdering like crazy. I was sitting there watching him play as people occasionally typed stuff in local how a lvl0-1 was doing all that. Seeing as he barely even plays games anymore, i was also surprised =o
