Honestly a lot of glitches in destiny come down to lag, which is something they have very little control over. Also player exploits are generally easy to fix. We know exactly why and how they happen, they usually just need to block things off in most cases. Figuring out why exactly a certain glitch happens only 1/10 runs, that's a lot harder to track down. Can they spend all kinds of time trying to fix smaller issues like that, that are harder to track down, sure. However it does and will take away from them providing new content. Anyways teleporting enemies, IME, is a lag thing. The game will stutter for a split second while the servers catch up, next thign you have enemies 20ft from where you last saw them. Anyways, sword disappearing seems to be triggered by explosions near the sword. Thrall explosions, late grenades or a rocket. Make sure nobody throws nades to clear thralls off the sword, throws nades as bearer is about to die, etc. Rocket him or nade him when his health is full then snipe him to death. I've never seen the sword disappear in those situations, ALWAYS in my eperience, there has been explosions near it as a trigger. (I'm assuming it's a physics thing and it falls through the map) The lamps not triggering sounds like a real gltich, I've heard of other complaints of it, but I can't say I've ever seen it, so I don't think it's too awful common. As a glitch, it's not common and even playtesting has it's limits. They get more "playtesting" releasing the raid live in 2 hours then they could get out of groups in 2 months paying them to run it. Anyways I've run the crota raid many times without any major glitches, it's far from unplayable or unbeatable in it's current state, even if occasionally "BS" happens.