Has anyone else had a problem with their X-Box?

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my friend used to own an X-box and he said i should get one,ive had my X-box for a little over a year and it constantly says it can not read some of my disks,i think it overheats if i let it sit for a while then it will work or if i blow into the disk tray it sometimes helps, also i bought a can of air and started using that on the back and it helps sometimes, has anyone else had this problem? and does anyone know what i can do to fix it? also those who own an X-box where did you buy and did you buy it new or used, i bought mine used from gamestop, also my brother bought one a little less than a year ago, and his wont read any disk most of the time he also bought his used from gamestop, we heard good things about the X-box before we got them, but now we are starting to think that it was a bad idea. Also anyone who has an X-box 360 do you have any problems with it? because that is the next system i wanna get and i wanna get some feedback on it before i actually buy it, and if you do have an X-box 360 what games would you suggest, i like games like Splinter Cell, Ghost Recon, Rainbow Six, and other war games.