I have a level 31, 29 and 28 and I've never raided because I think I'd be more hindrance than help.
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What system are you on
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My first VoG was a 28 and I was able to contribute, so you'll be fine.
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No. A level 23 is hindrance. Those are all good levels. That level 31 could even do CE hard and still help. You should definitely try it.
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You won't be a hindrance man