[Warrior] Endure Pain
I’m inclined to say bad. No cap-debuff is given to skills that grant either invulnerability or invisibility, http://wiki.guildwars2.com/wiki/Capture_point . Endure Pain grants neither, since you’re still susceptible to conditions and cc.
I do think Endure Pain could use some other nerf. Or perhaps make it require more skill to use effectively, say reduce recharge to a mere 12-15 seconds, grants its buff for only 1 or 2 seconds.