just played through the games in valves orange box recently which includes half life 2 episode 2, portal and team fortress 2 and found that portal was the best of the bunch. episode 2 was good but far too short. at about five hours worth of game its taken them just over a year and a half to put this out, what were they doing? taking excessivly long tea breaks. team fortress is just another dumb online shooter imo, its just running around blasting other online players [no bots] who are doing the same thing to you and for me this sort of gaming is dull and moronic. portal however is a different matter. its a puzzle game which has you using a gun that creates portals which you can jump through, so if you put one portal above an out of reach ledge and another in the floor you can drop through onto the aforementioned ledge. it requires you to think before you act, has no violence and is over in about three hours which is a real shame, if only the had ditched team fortress 2 and doubled the ammount of levels for both portal and ep 2.
if you want a taste of portal without having to fork out for the orange box then you could have a go at narbacular drop. nd was made by the same people who made portal [before working for valve] and is free to download, including loads of custom maps but be warned, nd is bloody difficult, a bit buggy and isnt as good or as polished as portal but you may find it interesting non the less as a taster.
