I agree with d2s and 47...
The problem isn't the AMOUNT of powers you get with bene, but the KIND of powers that you get with bene.
I can bene only 4-5 powers, among which will be Move Diagonal and Recursive. If it is operated toward the beginning of the game, it has good chances to be an insta 'GG'. On the other hand, I had instances where I bene'd like 20 powers, only to have 1 or 2 that I really needed, the rest being either passive powers or row and radial ones whereas I need column.
The main problem is usually bene-teach. 4 of my last 5 games against top players were ended as follows:
Me vs d2s: Bene-teach (to 2) GQ, Destroy Row, Destroy Radial, Relocate
Me vs d2s: Bene-teach (to 3) Smart Bombs
Me vs Sanzo: Teach (to 5) Smart bombs
Me vs Sanzo: Bene-teach (to 4) Recruit Column, Recruit Radial, Move Diagonal
Just make so that teach can't be inheritable by beneficiary, and 80% of problems linked to beneficiary will be eliminated. If teach is still a major problem, just make it more rare... no need to kill powers.
On the other hand, Onco, I can feel your pain. If I was swiped by bene 3 times in a row, I would have been pissed too.