I've played them all except The Fall, and it doesn't really interest me anyway.

Ranked for me is -

1. Deus Ex
2. Human Revolution
3. Invisible War

The first game is a masterpiece and is probably my 3rd favourite game of all time. I keep hearing that it's aged fairly badly, but I still play through every single year and have done for the last 10 years, and will do for the next 10 years.

I've gone through the game in every possible way (even buying that woman in the club 4000 credits worth of drinks...just because), and it still doesn't get old. Fox has pretty much covered all the fine points that make the game so great, so look one post up.

Invisible War was such a huge disappointment to me, and the rest of the world I think. That's all I have to say about that one.

HR was a step back into the light. It's one of my favourite games for the PS3, and Jensen is almost as awesome as JC. I'd even argue that the soundtrack is better than the original.

I'm definitely looking forward to the next main entry in the series. As for now? Time to go play some Deus Ex I think.