Depends on which ping you're measuring. Is this ping what you see from running a test like speedtest.net or pinging a website in command prompt? Or is this ping what's actually reported to you in-game by the game? Ping is a measure of latency between your computer and whatever server or client to which its connecting so a high enough ping causes you to lag in-game. If your 26ms ping is what's actually reported in-game by the game's menus, then your ping is exceptionally good. If your 26ms ping is what was measure by running a test at speedtest.net or something, then your ping is probably just about the norm from my experience. But that's also only your latency to the outside world.
Your ping will also differ between different gaming servers as well. If you have a 26ms ping running speedtest.net, then that's your latency to the outside world basically and it's good. So if you join gaming servers that consistently give you a really high ping, then you should be able to resonably assume you have a bad/laggy connection with just that server and not all servers. Just for something measure by though, I play games that are highly dependent upon a low ping/lag connection like MMO's and FPS's (WoW and BF:BC2 for examples) and my pings usually stay below 150ms and it's a good connection. When ping starts getting into the 300's then you're going to notice some lag in some games, not all.
Hope that helps. Anybody feel free, if I've misinformed on anything, to tell me I'm full of sh*t.