zona5101said it right, you asked for brutal honesty and it was given.
To shoot night games, you'll more than likely need a faster lens. Since I don't know what lens you were shooting with, I am going to assume it wasn't one that will allow you open up the aperture so you can get a faster shutter speed since this was shot at f/5. With the XSi, I don't think you'll even be able to shoot at a shutter speed of 1/500 even with a faster lens and still get a decent exposure since you would max out on the ISO at 1600, so you might have to go down a bit and shoot at least 250, you'd have a bit of motion blur but it shouldn't be too much.
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Lori Putman flickr
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