How far away are you?
Is your router 54mbps or 130mbps capable?
I have a Cisco WRT120N.
I also have a WET54G bridge and a VIA USB wireless pen and they both work great on 802.11g.
Time Warner cable is the real reason it works so nice though.
I don't really care if I get max speed, I just don't want to lag in my games. I play a lot of multiplayer and running a cable isn't really an option because it would be just to far. My computer will be about 7 feet away, however that's the room above my router. So 7 feet up, through the ceiling.
So I can't really run a wire, powerline or wireless are my only option.