This is a tough question. There's a lot of things that connect me to Oddworld and make it unique. [all this is referring to AO and, more or less, AE] First, there's the concept. Lorne Lanning decided to go against all odds and actually discourage violence/slaughter/aggression in videogames and use it as a method of telling a story. And there was something poetic about the story itself - a scrawny slave rising up, freeing his kind and standing up to the corporate menace that is constricting the Oddworld Universe. I just found that kind of empowering.
Then, of course, there's the art. Oddworld's design (well, mostly the design of Abe's Oddysee) is beyond beautiful and is more of an art form than a videogame. It's like it's a painting after a painting after a painting. [Referring to Abe's Oddysee...] And every part of the journey has this atmosphere to it. And it takes you so far, I mean, you start out in basically a filthy, industrialised slaughterhouse and then in the middle, you end up on a spiritual quest through holy Mudokon caverns. It really gives you the feeling that you're on this journey of great magnitude, that you're doing something important.
And for me personally, also the memories with this game add to the list of reasons I still enjoy it - I've had Abe's Oddysee since I was about eight, and I played it very frequently, both alone and with friends, I even snuck on my parents' computer when they were out so I could play it. So when I play it now, it like takes me back and there's an element of nostalgia to it...
I can't really explain it any better than that (well, I probably can, but...lazy

). It's just a part of me, still to this day.