Check out my sig link. Plenty of footage of sentinel pvp and being successful.
Its frustrating as hell but also rewarding. Fyi im not fifty yet and all of the footage is pre 1.1, there is still plenty of killing.
Playing a melee class without stealth and in happy knockback land means knowing when and how to engage, and who to engage. Going in, murdering a healer and popping cooldowns to get out or survive long enough to be healed is just one example.
The resolve system does **** us hard, getting stunned multiple times and never reaching full resolve before dying sucks. Killing people after they use everything and get you to 15% and then they go from full to dead makes up for it.
I pvp as watchman, I tried out combat and I just didn't like the eng nature of burst from status form, and bladestorm cries not being enough to compare with watchman zenith + merciless slash. Focus i'll try out when im geared.
If you want something easier just go watch that epic bounty hunter video where he has one ability on his bar.