Weak attacks like a multi-hit jab (the first two hits of Wolf's jabs, Link's spamtastic jabs, etc.) or very low-knockback tilts can be CCed at most-any percent. Weak projectiles as well, like Falco's Neutral-B. When ya have little damage, most-any attack with moderate or less knockback can be CCed as well. So no, don't try to CC a Falcon Punch.
Crouch Canceling is incredibly useful. Make as much use'a it while your damage is low as ya can, 'specially if your character has a good D-tilt/Smash. ohai roy
deadpool is the funniest game i have ever played. EVER.