It took me some time to get used to the grappling mechanic, but I think at least part of that was due to Bionic Commando reflexes failing me. The character also felt a little slippery, taking some time to decelerate before stopping or changing direction, and a lot of times I thought I'd caught the hook on a platform only to have it go right through.
But I persevered and beat the final boss (of the demo, that is)!
Really well done game overall.