Valve are just lazy. PC gives them no barriers and porting to Xbox is easy given the cross-compatibilities. There are far too many games (including exclusives) coming out for PS3 for this "complexity" to be an issue. It's like learning a new language, of course there is a learning curve but if you put the time in, it comes naturally afterwards.
As for Valve's resume of games it's good but not the best.
Team Fortress 2 = Good but most certainly not the best ever. Try Halo online, KillZone 2, COD4 Rainbow 6 Vegas 2 etc etc.
Left4Dead = A good game but hardly original.
Portal = Innovative but come on will anything ever beat Tetris as a puzzle game? Try PixelJunk Monsters also.
Half Life 1 & 2 = Very good games no doubt. Half-Life 1&2 are crown jewels for Valve.
Counter-Strike Source = A good MP game due to alot of community support but hardly something that makes Valve stand-out.
Valve are good developers but not great. Whilst HL1&2 stand-out the rest of the collection are highly subjective experiences.
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