Is it bad for a Christian to play doom or doom 3

The real answer, my friend, is up to you...
If you find that this is bad to you, then don't play it at all.
If you think that it is okay to play it, then do as you wish!

But if the game includes adultery, violence, etc.
Then it is probably best that you shouldn't.
Though as I said, the decision is entirely up to you.