Of course he's a serious politician, and a skilled one at that. He has managed to greatly strengthen ties with the US, outmaneuver most of his political 'enemies', keep the flow of western weapons coming into his country and get the entire western world to kind of shrug and forget that he had a journalist murdered and cut up with a bone saw.
But weapons have always flown into Saudi Arabia. They have to be proven both:
1. Not very effective in this war and
2. In general not very useful in the hands of Arabs https://www.meforum.org/441/why-arabs-lose-wars
I don't know Saudi Arabia well enoughto judge about this political enemies. I have read he has made some progress in modernization. Hi megalomaniac "neom" project seems to have failed, at least stalled. He has alienated Qatar, he has sided with the Israelis which could backfire easily from Muslim extremists.