Plenty of good players use Sunsinger. If you can't use Sunsinger because you become too dependent on self revive that's on you, not every other Sunsinger. Self-revive only makes a good player a better player because if they're not dumb and don't rely on it and therefore don't take unnecessary risks, then they can be a life saver to everyone else if something unfortunate happens and a lot of people die, especially during a Nightfall or Raid. I've run raids and nightfalls where everyone was a Sunnsinger and most of the time we only have 1 death, if any at all, because we're not bad players. Choosing any specific class doesn't make you a bad player. If you choose Sunsinger and you're dieing all the time that means you're a bad player and you'll likely die often as any other class.