last saturday i had a lot of matches :D
i played really good, and i want to share my experience
nair to nair to nair if really good! i could chain like 3 or more nairs in a row, then following with a tilt or a smash
marth's chain grab is not that bad (i'd say it sucks), my friend try to do it angaist me and i just rotate the stick/button smash and i get off really fast, after like 5 grabs, i made an air release, and those 5 grabs only did like 15% the next fights, he preferd to use his fthrow
i love jab cancel combos, you just have to know how your opponents react. I mean, some likes to shield, others like to attack, and other to shield grab. For example, for those who shield, grab, for those who attack, a lot of dtilts or jab-jab-dtilt-jab-jab-dtilt... and the shield grabbers (Marths), mindgames, make they think that your jab combo finish with one dtilt, wait a little, then Fsmash (dtilt pushes Marth off his standing grab range)
thundersliding catches people off guard, learn to use it in all stages, including FD
my friend uploaded some matches from that day (i lost all of them lol), you can watch them in the new video compendium, but hey, don't think i suck, those are just few matches where i suck (trust me, i play really good that day, my friend save the rest of the fights for an upcoming combo video)