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SpiderMad, there's a glitch in PM that will input jump-direction with the c-stick if it is hit during jumpsquat, it's actually fairly easy to do with Ike lol.
@Strongbad I wouldn't say 100% of the time, nor would I say the shield counter play is as insignificant as you make it out to be, (since you can interfere with fast-fall timings as well) but it is hard to argue against the reality of the mechanic. It is an artificial and arbitrary chance of failure in the current meta, though its' original intent was far from what it has become.
It reminds me alot of rng failure chances that you can actually control and influence, or unintuitive and abstract button inputs for certain moves and combo's in traditional 2D fighters. In any case, in its' current form it certainly has alot of parallels to mechanics in other games, though that isn't necessarily a good thing lol.
Ah well, it is kind of interesting how combos in melee were made possible through ONE arbitrary input as opposed to the dozens that can be required in more traditional fighters, it really does make for a very simplified and unique risk-reward/ arbitrary failure-chance mechanic when compared to 2D's. (though the sometimes odd inputs in 2D's are justifiable through a lack of proper (more intuitive and interactive) input devices)
/enduselessrambling
Edit: To be clear I don't love L-canceling, though I find it interesting, nor would I mind if it were removed. I do, however, take issue with people calling it a poor mechanic or bad game design as it has to many parallels to far more contrived mechanics in other games to be called as such.