Just in case anyone is wondering I did a little lookup on Hero Builder to see actually how much of a difference 6 slotting would be on AS. This is using EM as a primary.
No Slots: 19.4 Damage
To Hit Even: 75% +1: 68% +2: 61%
3 Slotted Damage, and 3 slotted Acc
37.9 Damage
To Hit Even: 146% +1: 139% +2: 132%
6 Slotted Damage/Acc (If We had access to Hami O's)
40.8 Damage
To Hit Even: 157% +1: 150% +2: 143%
Now add Build Up to the mix
56.4 Damage
To Hit Even: 199.5% +1: 190.5% +2: 181.7%
Now take in mind this is using Hero Builder. I am not sure of the accuarcy of the data. It seems that you get that little extra pop by 6 slotting anything, but when Build Up comes into play, a +16 BI and a HUGE boost in ACC thats pretty damn good if you ask me. I can just hope that Villains get the same access to these Enahncements as Heros do. I don't knock any Hero for using them, hey you got em, use em!!