I have had to deal with this and it is not easy especially if the person is a friend.
He does not sound like a bad DM not all DMs are good at everything and most of us have some weakness. As a DM I am not as good at running combats as other parts of the game.
I play to my strengths and stick to games that have a lot of story, puzzles and intrigue.
You should not talk to him but I wouldn't use words like bad. You should let him know the positive things he does well and then give him concrete advice on how to fix what he is doing poorly.
Others have given some good advice on things to do to help. What I found helpful was having my more tactically minded players give me advice during the combat. I have slowly gotten better with my tactics.
I would like to add that for DMs who are not as good in combat having players who are and who have designed min/max characters make it very hard for that type of DM. Take a really good at your characters. Maybe stick to core only classes for awhile while he finds his feet.
He does not sound like a bad DM not all DMs are good at everything and most of us have some weakness. As a DM I am not as good at running combats as other parts of the game.
I play to my strengths and stick to games that have a lot of story, puzzles and intrigue.
You should not talk to him but I wouldn't use words like bad. You should let him know the positive things he does well and then give him concrete advice on how to fix what he is doing poorly.
Others have given some good advice on things to do to help. What I found helpful was having my more tactically minded players give me advice during the combat. I have slowly gotten better with my tactics.
I would like to add that for DMs who are not as good in combat having players who are and who have designed min/max characters make it very hard for that type of DM. Take a really good at your characters. Maybe stick to core only classes for awhile while he finds his feet.