One of my friends bought the game for PC and said that the multiplayer generally isn't too laggy, but I would take his opinion with a grain of salt as this is the type of gamer who doesn't notice a huge difference between 20-30FPS at lowest settings and 100+FPS at highest settings in Source engine games. I remember seeing somewhere that pings usually range between around 30-150ms which to me ranges from great to poor.
I was skeptical of the multiplayer game at first due to the lack of dedicated servers, 19 players max, but it is suprisingly a good experience still. I haven't encountered much lag, my ping bar averages 4 bars and I was only disconnected once over four hours. The game isn't too demanding, with my Q6600 & GTX260, I averaged about 80FPS at 1900x1200 with everything cranked. Overall, I would give it a 7 out of 10.
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