They do have some really good ones.
It is interesting that in different episodes they often switch the dominant/passive roles, so it's not fixed as in Laurel and Hardy.
Most of the mare crap, but the following ones almost killed Ciro Santilli:
- Video "Bill Gates vs Steve Jobs by Epic Rap Battles of History (2012)"
- https://www.youtube.com/watch?v=ZT2z0nrsQ8o Rasputin vs Stalin. Epic Rap Battles of History (2013)