Take on Helicopters is still a very challenging game even though the Online experience has now been deprecated as the normal online servers are now unreachable. It needs to be played without the auto-hover option though because that makes it too easily but those without experience with helo-simulations will find it necessary to use it at first or it will simply be unplayable.
On Trainee level it can be played with just keyboard + mouse, they higher levels are probably near impossible without either rudder pedals or a good flying joystick.
This is probably for the somewhat more patient player and young players may find this all a bit too slow compared to arcade type games. This game is either for you or it is not but those that find it fun will probably find they also want to have a look at flight simulators like DSC (possibly the best helo simulator atm), FSX or X plane. Keep in mind that the helos in Take On Helicopters do not have a completely true Flight Model : purists would be disappointed, but it feels plenty realistic for the beginner to the helo sim genre.