@ Kennypoopoo: Yeah, I do the same thing too. Well, at least I practice it and make an attempt to do it in battle. It's a good substitute to dair (and nair) when your opponent has a high percentage and you want to do shine combos. You can shine-combo even if the second hit misses. If the second hit connects, then they will be launched into the air if they have really high damage, otherwise they shouldn't go very far off the ground.
@ Serpentine: At low percents, it might be possible to attack a Marth before he recovers from the stun of the hit (I'm not positive though). Marth is floaty, so he'll get sent further away, therefore he has more time to recover from the hitlag. Once that happens, then he's virtually untouchable, with that long sword. The sword is a disjointed hitbox, so there is no outprioritizing it, unless you use a move that has a disjointed hitbox with equal or greater priority AND equal or greater length. In otherwords, another Marth (Roy MIGHT work, but I doubt that). At this point, it all comes down to whoever hits first. (If both people hit each other at the same time, then both will get hit).
Instead of attacking head-on, I suggest maybe like fulljump triple lasers (fulljump away and reverse the lasers, if you think you're in Marth's range). That way you can still do damage, and he can't get away from that. You can even combo him more if he's still stuck in the hitlag of the lasers. He can get away from the lasers if he airdodges, counters, use second jump, or upb. All of those would just make him more vulnerable though.
Or you can wait or fake the Marth out into doing an aerial, then go in for the kill. In other words, mindgames. Marth is somewhat vulnerable when he's in the air - mainly right after he misses an aerial. As for Falco's highest priority move, definitely not fair and uair. I'd say it's either dair, nair, or bair. The order should be: (greatest to least) bair, dair, nair. I'm not 100% sure though. Bair and dair are so close, I can't really tell. I'm fairly certain about the nair though. Hehe, sorry for the essay response.
Does anyone know where the sweetspot of the uair is? If there is one? Also, what are good moves to go into after a throw? Cuz most of the time people recover from the hitlag and counter attack. (I think it's because of the laser's hitstun).