Afraid to say it though but I think it might be your PS3 acting up. I was just playing the Tomb Raider Trilogy, and it read the disc fine. Try clearing out the dust by taking a vacuum hose and clear out the dust by sucking it through the vents. I say that because one time I popped a disc in and I heard an "odd" noise when it was going in and ejecting. Problem was solved after I sucked the dust out of the vents with the hose (if you're using a slim there's vents on the back, underneath the sides, etc). If that doesn't work, try using a laser cleaning disc. If not, then your PS3 might be gone.
However, I have read that there is a hardware issue when it comes to the chips (such as the PS3 eating up thermal paste like crazy but I suspect that they were using cheap/low grade thermal paste). But don't jump the gun on voiding your warranty until you've cleaned the dust out via a hose to the vents just yet.
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