You are since you are using a 3800 gateway. That is for VDSL which is interleaved which is higher latency than fastpath old school xDSL. You need to run a trace route and see what you hops are. Could be bad routing in your area.
I'm a PC gamer primarily playing Team Fortress 2, Battlefield Heroes, Planetside 2.
The best ping test result I've gotten was 25-26 and 0-1 jitter(like yours) BUT that was for one night(for a few hours), and was the first or only time I've seen it that way.
