The thing with Half-Life 2 is that it did a lot of things really good when it came out and a lot of games have copied them (and probably improved them), so if you play it now you'll probably think something like "omg this game that came out a year/two/three/four years after H-L 2 is so much...
Using a DVD5 PAL version of the game, unpatched, on my PAL console.
Everything works great, I think the first video or something lagged a bit.
Played about three hours, no other problems so far.
Guitar Hero: Aerosmith - Sound does not seem to be perfectly synced, but it seems to be almost perfect if you pause and unpause at the start of a song. Otherwise, the videos and loadings are great.