Good_
- Good sound (without that, the rest is irrelevant)
- Tight, well-rehearsed sets
- The right amount of crowd interaction
- Interaction between DJ and MC
- Acapellas
- Tight freestyles
- Dance elements (depending on act)
- Live music elements (doesn't have to be instruments, could just be playing with the backing beats in Abelton)
- Visuals (not just some small little projector either)
Bad_
- Bad sound
- Shouting into mic
- Apologising for anything
- Bad freestyles (if you can't do it, don't try it - it sounds mad kak)
- Too much talking in between tracks
- Not taking backpack off
- Looking nervous
- Being drunk and thinking no one will notice
Good performers I've seen recently: Driemanskap, Rattex, Ben Sharpa, Max Normal, The Realist, Wordsworth, Sweat X