The only further Nerf he could use is a slight tweak in his lv 3.
Keep in mind, when the current top ranked characters like kratos and raiden get nerfed, sackboy can only do better in ranked without such harsh competition. If a player can skillfully use other characters then a skilled player can also master sackboy
Just went to review an AP requirement list... and Sackboy's new level 1 requires 150 AP similar to Sly's/Nathan's/Fat's/Rachet's/Dante's/Nariko's/Rai
Nice job superbot. Really nice.
^ It's true, although his level 3 makes up for it. Well, it's supposed to except now it takes an extremely long time to build to it in comparison to the other characters. Combine this with the fact that he builds AP much slower than nearly all those characters that you listed and you have a major reason as to why he is broken in timed FFA gameplay :'(
All 6+ kill level 3s cost 750- so that's fair (to an extent)- but his level 1 should not cost as much as 3 kill level 1s. It's a 1 kill- 2 at best super.