In my opinion, Kratos is the only "noob" character. Simply because of his right/left-square, good supers, and the ability to "lock" characters into the ground by spamming down-square over and over again (although there are several characters who have the ability to do this - try it sometime, ha.) He would be balanced well from a slight AP decrease OR making his right/left square have decreased ranged.
I don't use Sackboy, but he is a great contribution to this game in my opinion. His move set is unique, hard for beginners to understand, and is overall a good character. I think he is fine the way he is. Maybe a very slight decrease (-5AP) for some of his trap moves.
I think sackboy really shines in FFA and is less effective in 2v2
My current 2v2 team says otherwise. Sackboy (friend) + Radeck (me) is tremendously effective. It is disgusting how easily we win sometimes. Here are some highlights:
-Winning 34 to -9 -Radec getting 8 kills with his lvl1 alone -Sackboy getting 10 kills by using his lvl3 TWICE in a single match -Completing 75% of our matches with zero deaths.
Granted, really skilled opponents still give us a run for our money. However, out of about 20 or so games, we only lost once, to Evil Cole/Sly. Those guys were scary good.
In a 2v2 match, Sackboy is disruption and enabling. He builds meter incredibly fast. His lvl3 is arguably the strongest in the game, and is even better in a 2v2. While Sackboy is getting kills with his lvl3, I run around gaining AP from the bubbles and grab a powerful item to use once the lvl3 is over.
Sackboy MIGHT be the only overpowered character at the moment. I can't say for certain, but he is an absolute NIGHTMARE to fight against, individual player skill aside.
Xboxlive/PSN: Lanoitakude "What can be asserted without evidence can also be dismissed without evidence."