There is no way to be over-leveled in Destiny. Your damage/defense scales down to the level of the enemies you're fighting, so even at level 33, the game is effectively treating you as if you're level 16. You will never be able to go into a lower-level activity, and one-shot everything you come across. Keep that in mind, and play smartly, and you should be ok.
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I understand that but, I went from dying once every 5-6 quest to dying 7-9 times every quest and the only thing that changed was the expansion pack. Essentially, the game went from Normal to Hardcore and I'm not good enough for hardcore. My nephew (who can play hardcore) say's it got drastically harder and he can't figure out why.