This... Isn't trolling behavior in PvP... At all. It's a viable strat to securing kills in Secure and Shatter that mostly only newbs and shmucks fall for (are you carelessly chasing that lone tank in Shatter over the southeast cliff area? Yeah, enjoy your stun+knockback death). My advice is to be wary of all tanks in high-elevated areas in Secure and Shatter- and MCHs, they possess a knockback as well; don't allow yourself to be within like 20 feet of a cliff when engaging them because they'll likely be waiting for the chance to immobilize you and knock you off for a fast kill.

"Ganking" (and ignoring objectives?) isn't trolling either, and arguably its the most effective way of securing quick kills but if you notice few people participating in it, they are a liability for their team at worst and a distraction at best. If they get away with it for a long period of time and manage to somehow farm a significant battle high- that says more about the quality of your team than them. When a large group (read: no less than 1 full party) performs this, then its harder to deal with and is what I guess they call a "murder ball." It's frustrating, but if they managed to herd the cats that is a Frontlines team into doing it, good on them; that's why the kill streak bonuses exist. Full premades doing this was a problem, which is why we're now limited to parties of 4, which is less out-of-hand should they decide to go this route

tldr: yes, you are wasting your time.