Having played through original trilogy recently and getting the good ending in each I'd say despite some major frustration particularly in the first two these are still reasonably fun games. The one major issue with them all is the fixed camera, there are levels that required you to double back on yourself to find all the crap and you just couldn't see where you were going, that and the boxes not being saved at checkpoints in CB1
I'm not sure I'd pay for them again unless they were in a sale. I think I'd rather see a tarted up Spyro collection. I own all three and though I've only beaten the first it's an infinitely better game than Crash 1, 2 or 3.