I'm fairly liberal, but I admit I'm scared what would happen if they just legalized it.
I've got family that uses it regularly. They are the most angry, snappy, short-tempered people ever. Of the six regular users in my family, only one has a regular job. The others haven't worked in decades.
I had a couple friends when I was a teenager who started doing weed daily. They went from being athletes to being no-ambition slugs who sit around all day living with their parents and using their welfare checks to smoke weed. It sounds like I'm making it up, but I'm not. I've known a couple people who can function using the stuff recreationally like once a week. But I can honestly say I've never known a regular user of it that has anything going for them in life.
And for all the talk of it being a herb or somehow not as bad as smoking, I call bullshit. Those two friends of mine were not tobacco smokers. I've smoked since I was 13 and I don't sound as bad as they did the last time I talked to them. They're not on anything else to the best of my knowledge. But they clearly had messed up their lungs as much as they did every other aspect of their lives.
As far as the game play aspect, I play a lot of Halo 3. With the weed users, it's usually a 1 good weeding smoking player to 10 bad ones ratio. I can say the best player I know is a huge stoner. But most of the them are terrible, uncordinated, bad shots, can't take direction in team matches, and half the time disappear in the middle of the game because they have no attention span.