The point is that all devices not accepted as standards at the time of launch are considered "gimmicks". The mouse was just that when Xerox PARC showed it off, and look what it became. No one thought the GUI would take off either. It too was a gimmick because you had a whole generation addicted to arcane command-line input, which has since become a niche market for programmers only.
All such implements are disruptive to the market initially and then copied ad nauseam until they're the standard. Calling the Wiimote a "gimmick" can be neatly shoe-boxed in next to Xerox's idea that the mouse was little more than a silly notion. It's the sort of mentality we should have grown out of by now as avid users of technology, but haven't because of the fundamental human fear of change.
i see what your saying but unlike d-pads and analog sticks it isnt easy to incorporate the wii mote into existing game conventions. since this is rpgfan i'll use rpg's. i can only think of 2 rpg's that could of made nice usage of the wii mote. shadows hearts because of the judgement ring and monster hunter because monster hunter uses the right analog stick for attacking and also has a vibration based fishing system.