dont worry about it; we all gotta start somewhere
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besides, you're playing against marth and he's part of Lucas' "Deadly Four"
ok time to critique...
0:11-not a good time to grab. dont grab out of a shield, because lucas' grab is waay too slow. if you're going to grab, use a pivot grab or wait for a better time.
0:55- no need for PKT2; and if u were gonna use it, aim for the ledge. u went towards the middle platform and that's exactly where marth would want you to be because he can follow up with an aerial(s). Thankfully, he missed and you DI'd away

1:38- dont shield grab mister!
2:13- that wasnt a good time to use PKT, but u made up for it with the forward smash
2:15-2:18- AWESOME. great use of RAR
2:45- Psi-magnet is good once in awhile as an attack. i personally like to use it to punish bad rolls,but it's a little risky to use it against a marth. he hit u with DB afterwards.
2:51-
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again, you hit him with it, but be careful when using it

3:30- Upsmash for the win!
good job Oni=]
sorry but i dont hav time to watch the other matches.
you won and that's great,
but work on using PKF, Nair and Dair more often. You hav to space yourself, especially with Lucas because against a better marth, you'll get grab release'd ->dsmash'd in the face. his aerials will also kill you. space if your best friend when playing as lucas
again, nice job