well my disks get ejected spinning pretty much all the time and going round on a plastic base isnt great for scratches.. it sounds bad.
also one time my 170quid xp cd spun off the tray and got lodged in the drive slot
CDs only have a limited life. Its a fairly long one but its still limited. 3 1/2 in floppies are incredibly unreliable. on the one hand I have some 14 year old DOS floppies that are fine. On the other hand some 2 year old ones are broken. Compared to this CDs are much better
I saw a report in a magasine they were testing CD-Rs to see how long they lasted. apparently some died in 6 months. They were CD-Rws and they used them according to average use
besides. dont worry about it!
some games offer replacement CD services anyway