Honestly had waaaaaaay more trouble on VR12 than VR18. The wonky auto-aim and bad camera against walls/ninja running really shows it's ass on that one.
VR18 is just:
wave 1: perfect parry gecko, lol dwarves
Wave 2: perfect parry off the wall/dropkick you see coming a mile away, lol dwarves, charge up Pincer for next wave
wave 3: unleash pincer, sending dog flying, kill him real quick, tap triangle for pole arm until all dwarves are dead, then purple Sai stun the hammer bros and take advantage of their huuuuuge recovery time on attacks(either 3 hit combo, yellow, or double spin)
wave 4: lol dwarves
wave 5: purple sai on GRAD, mash light attack, by the time he's out of stun, purple sai again, rinse and repeat
meh