For Marcbri:
0:14 - Don't stay at the edge if you don't need to. You can't exert strong stage control if you're at the edge. (This is also why you got grabbed.)
0:38 - Bad positioning (stuck in between a Waddle Doo and DDD on top), so you should have retreated.
0:56 - Don't run to the edge when your opponent has invincibility. All you're doing is cornering yourself. Try to maintain your spacing near the center, even if he has invincibility. Also, momentum cancel with Uair - it finishes more quickly.
1:00 - Way too much shine stalling. You could have double jumped or fast fall air dodged, at that distance.
1:21 - You're right, you should have camped more, especially at places like this.
1:51 - You know why DDD didn't die after 3 Usmashes? Stale moves. You should have waited, fired some lasers, and maybe tried for a Bair kill.
2:01 - Random Fsmashes. Eyes...bleeding...
2:10 - Fire lasers at the Waddle Doo to replenish moves. Also, excellent spacing at the ledge. You severely limit DDD's options from the ledge at that distance.
2:32 - Camp! His invincibility is out; why are you running into Utilt?
2:40 - LOL @ running into DDD's Usmash
2:56 - Don't throw out random moves (especially Dtilt) when he's not next to you.
Overall, not bad, but you need to watch your positioning more. Practice camping, practicing moving with your SHDL, etc. etc. Be patient.