You're going to give up because the mouse lags a bit?!
Talk about first world problems.
You ought to go through the menus using the arrow keys?
No, I mean that the mouse feels all laggy even in the game itself. Strange because, in newer games that I'd assume to be more difficult work for the service such as Human Revolution, OnLive runs flawlessly on my internet connection.
Sounds like it, because you definitely don't have the default controls. Just take a few minutes to rebind them. Trust me, Deus Ex is an experience that you don't want to miss out on.
I may rebind them. However, the game blatantly isn't running too well on the service so I may just give it a miss. Not too fussed about playing the original to be honest, despite how much people rave about it.
It will take minutes to go through and return them all to default keybindings, even if you do it manually. if you map them back to default then you don't even really have to think about it.
It's obviously unplayable as your controls are messed up, it's nothing to do with the game or gameplay itself, the solution is simple if you want to play it...
Resetting the controls to default doesn't reset them to what the game's manual, having looked online, says. Mouse lag is also a issue and, frankly, I don't really want to buy the game. Probably just give it a miss, but thanks for the suggestions everyone.