It is clunky and I am also old, slow, and uncoordinated. I did manage to finish it, and I ended up liking it overall. I didn't care for the Batmobile stuff, and I was never good at it. But once I got "good enough" at the Batmobile sections and could solve the puzzles, etc, I have to admit I found it satisfying in the same way you feel after getting your taxes or colonoscopy over with.
If you decide to walk away from it, you aren't missing anything super fantastic. I love the series, but there's no requirement to complete all of the games. Life is short, there are lots of other things to do. No need to beat your head against the wall on it.
You might like the Spider-Man games better. The combo moves, power ups, suit choices, etc, are more customizable there and I think it 'flows' better. Zipping around a realistic map of NYC is really damned cool, too. (Though I did find myself missing the moody atmosphere and je ne sais quoi of Gotham and Bats). There is are the occasional nasty / annoying boss fights in Spider-Man (one of them early on) but once you face roll past them, the rest of the game is hella fun.