According to this thread a good players is defined by the amount of kills he makes. How about builders?
For attackers, take the efficiency, not the amount of kills
. For builders... Well, user defined
. Is a builder only good, because it defeats many aliens? This depends on the other team.
The name of the thread is "List of pro to Pro-ish players". In no way shape or form does it state that to be a player requires you to have a gun better than the blaster. In fact, IMHO, a good builder is better than an equally skilled player. This is because of two main factors (again, IMHO):
1) anyone can shoot something. Anyone can put some buildings in a formation. It takes a pretty good
player to build a base capable of withstanding an attack.
2) builders take a lot of crap from people, yet without them, we could not spawn, heal, or kill anything. A builder is essential to every team.
Now, if someone wants to rename the thread to "List of Pro to Pro-ish players who wield a decent gun" (as the blaster is 73h 5ux0r), then fine, but otherwise I think you should include the builders, as they are players too.