I thought the idea for 4e was that the powers were balanced? Wasn't that one of the major benefits. One might be more advantageous in a given situation, but if one is simply always better, not being able to do it more than once sounds like a pretty poor balance. Honestly I think we might have benefited from power creation criteria in the DMG, so that we could compare the balance and make adjustments. But that's an aside.
As for it being boring if the player decides to spam, lets face it. If someone feels like not making the effort they can be boring no matter how many powers they have. It is not like the descriptions that the book gives are exactly evocative imagery. If your at-will isn't boring, the chance of using the Horse-Cutting Thrust more than once is far outweighed by the chance that it is the only move that you'd use that day.
I would personally have perferred that the power source mattered just a little bit, even if it was something that only the class designer would have pegged intially.
As for it being boring if the player decides to spam, lets face it. If someone feels like not making the effort they can be boring no matter how many powers they have. It is not like the descriptions that the book gives are exactly evocative imagery. If your at-will isn't boring, the chance of using the Horse-Cutting Thrust more than once is far outweighed by the chance that it is the only move that you'd use that day.
I would personally have perferred that the power source mattered just a little bit, even if it was something that only the class designer would have pegged intially.