Sure, melee can be fun once in a while, but only up to a certain point.
You have to know when to stop ;)
What Murk said in the first post is crucial;
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Griefing is the behavior of a player which negatively impacts the experience for other players by abusing certain game mechanics in a way not intended.
Certain people have a very crappy attitude towards their playstyle, somewhere in the area of "I play however I like, who are you to tell me how to play?".
The thing is that TF2 is based around teamplay (or just plain luck on publics :p) to win, and if you're one of those who only melee and jerk around, then you're
not contributing to anything besides your own fun. This can be considered griefing, which I think it is if it's a consistent behavior. Alot of people get pissed when
someone plays like this, and I fully agree with them. You're just wasting a player slot on that server.
On the other side, we don't like to tell people how to play. However, we set certain limits to how much you can "do whatever you want".
What people don't always seem to remember is that playing on the SpA servers is not a right, it's a privilege. It's far from a democracy, and
the norms of society pretty much doesn't exist. The only thing you as players have to do is follow the server rules and everything is fine.