Smash balls are cheap. I suck with Ike and just by using smash balls, I was able to kill 12 times in a 5 stock FFA. Sure its a power that requires a bit of thought, but the advantage you get is incredible enough to overlap skill.
Edit to restate: What I am saying here is that yes, I really do think that smash balls will require skills to master. But, just to point out here, when the smash balls did not exist, I just got pwned left and right. This maybe because people I was playing with weren't that powerful, but still. Oh and another note, if a smash ball appears near me when I am playing my main, I can open it 90% of the time. Notice squirtle's fair/bair opens these things REALLY easily.
Its deeper than a lot of people give it credit for, but I don't really think it warrants tournament use.