He's good at picking his targets. Kerrigan and Leed are better, but they largely do the same as Maganda does and pick their targets...aka unaware or engaged players. Same as all good cav do.
Watching Maganda just now...he only picks up 1-2 kills if he goes near spawn so it's not really to do with afkers ect.
And that's the reason why I say that only 2H are really skilled in this mod.
To be solid cav all you need is battle awareness or what you said, to have knowledge who to strike and who to leave alone (for example even if he can lance me most of the time Leed choose not to because there are far easier targets aka I can down block , he only goes after me when I'm super busy
)
To be good archer you need some pratice to get familiar with arc, after that it's all about battle awareness, again.
Sword&board is all about battle awareness, some feints and good momentum, blocking is super easy.
Xbow is all about battle awareness and good camouflage skills (or roof camping). Sir Agor is scoring kills as xbowman and I know for a fact that he can't kill shit with 2H or polearms.
HAs and mounted xbowmen are annoying and useless as much as they are retarded. Trolling classes.
2H/polearms requires great battle awareness, good dodging skills, good attacking skills and excellent blocking skills. Many people try to play 2H but only portion of them have good scores and those people can play any other class and be epic with no problem at all.