Is the protective coating any good ?

[Carlsberg19]

My big question about blu-ray is this...IS THE PROTECTIVE COATING ANY GOOD?

the reason i ask is, before blu-ray came about i rented and copied about 400 dvd's that i collected over the years and stored them in a lockable number located dvd case, 4 years later, any of them dvd's i play are gauranteed to stick and generally cause me enough frustration to snap the disc in 2 even though the discs are in immaculate condition and played perfectly when i first copied them? why is this happening? and more so i hope blu-ray doesnt go down the same road in the coming years.