No offence to Pardus, this excellent image shows the detail and saturation possible even at high iso's with a 7D, I would say that set up for RAW and with the slightest of post-processing a lot of the background noise (unobtrusive in this JPEG, but there in the shadows) could be easily removed.
I think, as this and the earlier images posted show, any fears of poor image quality are largely ill founded.
The latest cameras in the best of hands are better, but for the money, in fact at any price, the 7D can be a formiddable sports camera.
I would augment my earlier comments by saying that good glass is important (what lenses do you have just now? the 85 f1.8 and 100mm f2 make brilliant short sports lenses on the 7D) and camera set up is important (tweak the AF, shoot RAW)
I have to agree. I bought a 7D as my first dSLR having not shot in years, and back then it was film.
My post skills were, and still, are not the best, so I kept thinking the shots were not that great and very noisy. Lo and behold, I had become a pixel peeper, and did not even know it.
Anyway what Paul said is great advice. Spend a bit of time to get the RAW work flow down. You will need to eventually anyways. Had I figured some things out sooner I would probably still have the 7D and not done the full frame upgrade which I can't say I regret a lot but, it's only money.
As others suggested, look up photos of what the 7D can do and you will see it can do a whole lot!