When you fight Batgirl, Killer Frost, and Nightwing players every day, Deathstroke's mix ups hardly seem like mix ups. The former characters have 50/50 mix ups that reset into more 50/50 mix ups. You can do nothing but guess. In Nightwing's case, he has such strong frame traps that you have no choice but to waste meter on push block. Deathstroke's options do not compare.