What configuration do you run you robo cub?
I assume it's Bite, Repair, Maul?
Let me know
The super charge nurf, will effect the damage output of the bear, but not by much. The change to supercharge is basically making it a 4 turn CD, and doing 125% dmg instead of 150%. DMG wise its not much of a change.
Basically, Demolish (pretty much the hardest hitting single attack around) +125% is still going to nearly 1 shot any pet; and with demolishes miss rate you tend to not need to worry about how long the supercharge CD is.
My generall strat for using him is, Supercharge > Demolish > (if hit) Repair > (if miss) > Demolish > (if 60% hp or lower) Repair.
The fact that demolish has such a high miss rate dosent matter as the robo cub can tank so much dmg (my repairs usually heal for over 1000). Eventually you will land a hit which will in general (after the nurf) still hit for a MINIMUM of 1350, and if the RNG gods are in your favor you will 1 shot most pets, if not a 2nd demolish will be over kill :)'
As long as you are not fighting another super hard hitter or an elemental this guy will win almost any fight through his survivability.
EDIT - for comparisons sake the old Demolish + Supercharge hit for around 1550, 1 shotting normal HP pets, but still letting higher hp pets survive. The main difference the nurf makes is that there will be a few more pets out there that will need to be hit 2 times.