It's funny you should say this because I was just thinking about how in the King Kong game, you can't jump either and yet that game was pretty fun (for what it was mind you).
I agree with some people here in that at first on the original NES version, I was so frustrated after playing games like Mario and not being able to jump. I kept mis-firing the bionic arm in all sorts of directions and would fail to negotiate gaps with it or completely forget that I could duck under some shots from bad guys.
As time progressed the levels themselves seemed to train me for the skill I would most definitely need later on to defeat the final boss on the final level. The beauty of it was that you didn't see that until you came back to redo some of the earlier levels and found yourself whipping through them like a bionic monkey. I just did that again last night for some fun and was able to get the achievement for not firing a single shot. Just swung through the levels, snatched people up with my arm and generally avoided all sorts of previous problems with ease.
I have to admit that the simulations they put into the game (the holographic "solid snake" style training levels) are worth their weight in microsoft points. They add a nice touch to the game and make for some fun challenges.
Overall I think the point in not being able to jump in this game is what makes it unique as the gamer is forced to think and negotiate with only the assistance of their bionic arm.
(Doesn't mean I don't get ticked off though when I'm swinging on those moving elevators and the arm fails to snag an overhead vent and I fall to my doom lol)
-PAN
There is no mystery...only truth.