The new controller isn't suited to all sports games no, but it has great potential for the ones I mentioned.
For games like baseball and tennis, it's limiting the player to the player's abilities. I can't hit a baseball for toffee, so a baseball controller would leave me incapable of playing.
But then if your not limited by your abilities in baseball games on a standard controller then how is that any fun? Because its not just a case of everything having to either be a total simulation or totally automatic. No more in games using Revs controller then it is with current controllers. The game would have difficulty settings with differing levels of assistance, just like they do this gen. In simulation mode the game would act almost as if your really playing Tennis (something that's impossible with current controllers), so in that mode you'd really need to be good at Tennis. However in novice mode the rules would be a lot more like current games, just with a more natural control method. The game would limit your swing to standard paterns and your swing would just control power and direction (like a button and stick do now). The game would assist in making the ball go over the net and help to keep it in the court unless far too much power was used. Medium settings would be somewhere in between. For different kinds of shots (lob, slice ect) in novice mode you would hold different buttons to change the way you hit the ball. Obviously in simulation mode your hand movement would decide what kind of shot your taking.
That said, I guess computer aids could be put in place where perhaps only swing speed matters, rather then accuracy. But then there's no challenge, and so I don't know where the entertainment factor would come in. The challenge is hitting at the right time to send the ball where you want. If that's all automatic all you're really doing is swinging your arms back and forth.
Same as above, but just to be a bit more specific on this particular sport this is how I see it. The bat would stay within the normal path on anything other then simulation mode (you know the deal, over the shoulder and swinging round accross the leg). On novice you only need to come close-ish to the ball to hit it, in medium you need to get very close, in hard you need to actually make perfect contact just like real Baseball (in hard you also have absolute control of where to move the bat). They do this already in current Baseball games on standard controllers. Its just a case of changing the control of how to swing from an unatural stick and button to a natural swing of the arms.
For snooker and pool...no, just no! You can't simulate a cue accurately with a small handheld device. I doubt any computer game will be a fair approximation of a real table.
Of course it won't be an perfect real life recreation of Pool/Snooker, but its hardly fair to hold a game up to those standards is it? No current Snooker or Pool game is anywhere near reality afterall, nor can it be using such limited controller, but it can still be fun to play. The important thing is that a controller like Revolutions will improve Snooker/Pool video games, making them much closer to the real thing (at the same time making them more fun to play). They could even include a cue attachment for the controller
This is how I see the game working. Novice/Medium mode - The virtual cue, on the screen, moves between balls by clicking a button. Once your aimed at the ball you want to hit you use the movement of the controller to move the cue within the boundries of the ball (it only moves the stick around within those boundries and uses a red dot to show you where your going to hit). If you want you could even rest the controller on your fingers. You then pull the controller back and push forward for differing degree's of power. There could also be physics assistance in Novice mode to make it easier to pot (just like with current Snooker games) and in this mode the vertical/horizontal sensetivity of the controller would also be dropped when taking a shot (to minimize the possibility of mis-cue's). In Simulation you would get very little assistance and could maybe even have full control of the cue (allowing possible misses of the ball).