5 games in one and there all great!
Graphics - 9/10 even with the amount of time half life 2 has been out it still has excellent graphics the new episode 2 has improved graphics aswell.
Gameplay - 10/10 half life 2 and portal both have excellent gameplay. You wont find a better first person shooter about than half life 2, perfect controls even when driving in the various vehicles, good weapons, intelligent enemies, not to hard or to easy. portal has some very original puzzle gameplay.
storyline - 7/10 good storyline set in the future which gives a good atmosphere , good characters.
Sound - 9/10 sound effects are great along with voice acting.
Longevity - 10/10 halflife 2, episode 1 and 2 will take about 20 hours to complete altogether, add another 2 or 3 hours for portal and then the multiplayer team fortress (which i didnt play) all add up to a lot gameplay.