You could control intensity via the analogue face buttons, direction via the analogue stick at the same time the button is pressed (hence the reason I said it could be re-mapped via the use of buttons or a combination thereof..)
Granted you'd end up with an experience which is much less intuitive but in the end the end result (a tennis game) is not only possible using the conventional controller but has been done a million times over with some very good results (Virtua Tennis for example..)
And the fun factor would be what? I think it's not really comparable.
I consider the controller a novelty because its something that one can immediately draw enjoyment from using since it's not something one maybe familiar with..
Ok, I understood "novelty" rather as something negative in this context.
It's unlikely then that you've played any of them for more than a few minutes (by your own logic..)
Oh, but I've had a PC with a gamepad since the dawn of time