All styles and instructors vary, some are better at doing and will tap you out every time - but cant teach for toffee. Some are better coaches but due to age and injury can't do much these days - but they can teach you. Some rare instructors can do both - or can for a short while in their 20s and 30s.
Some folk are just a bit shite, though. I don't know what category the chaps you are training with fall into...
Postatem obscuri lateris nescitis!
Martial arts, self defence and jiu jitsu in Bedford and Huntingdon - www.jitsu.me