Probably one of the reasons the concept was overlooked prior. While you have good sound quality, a clear and unique voice, and actual things to say, this is far from the norm. You know, flood gates an' all.
I didn't want there to be back-to-back updates of the same content, so I was waiting for anything to break up the clump. Guess what doesn't come up much anymore? (see stressed word of prior sentence for a hint)
"Interesting" would be the ideal. Less of things like K64's Burning/Ice combo and more like the Bomb/Cutter. We don't any "look how dumb this ability is, lullz", especially if you plan on doing more than one.
No doubles is gonna remain no doubles. Arguably, one should be able to pull out a different ability to get the desired effect. For example, Cutter/Sword for a big scimitar, Hammer/Stone for a mighty maul, ... uh, Archer or Crash Missile/Bomb for a missile array? Certainly not Archer -- that'd be stupid.
Well, the Dark Matter Trilogy had bad combinations for abilities, such as Kine + (insert anything) and some of the 64 mixes, but they also were single functions. Remember the opener to this I.F.? How it was about expanding upon things? Usually, effort isn't wasted on garbage. (Unless extremely comical, like Mints' Ouch Ability Review, which I apparently can't make a link to :/)