A vanguard that knows how to play the class is a great asset, able to easily take care of sudden problems and flanking foes and generally act as a brilliant mixture of support and front-line offense. However, a vanguard like that is really rare and most of the time you just get charge-spammers that fall down 10 seconds to the round or nova-spammers that make aiming a living hell for everyone else. Plus the line between a skillful vanguard that supports their team and a skillful vanguard that pretty much robs all the XP is really hard to balance.

I do love playing vanguard but tend to avoid doing so most of the time; it's too easy to slip into being a general annoyance by accident and I really don't like letting my team down.