Ok, so I tested all my PS2 games, and although obviously I havent played far into any of them, it's nowhere near as bad as some people have been saying!
51 work, and 17 dont.
I did notice a few glitches on some of them, mainly graphical, but to be honest, some of them I can honestly say I will never play again as I can really see the graphical limitations the PS2 was up against.
Still, nice to know I can still give them a go if I get nostalgic!
It is weird though with some of the games that do and dont work.
For instance Gran Turismo 3 & GT 4 prologue work, but GT 4 doesnt!
All of the James Bond games work, except Everything or nothing.
I also had 3 games that I bought used that didnt work cause they were badly scratched, and two of them actually work now!
Also, I tested the online capability of a Smackdown vs Raw 2007, and it works fine!