Kind of complicated. Initially I thought he was ideal when this was discussed a couple of months back but since then I have looked into him a little deeper and there is a fair amount of negativity from the fans of the clubs he already owns which is a red flag. It is also hard to get to the bottom of whether he is a fan or not due to the heavy Chelsea links, he may have liked United growing up but frankly I can't imagine an actual fan being a season ticket holder of a rival club.
With all of that being said he may actually be an ideal owner if it comes to pass, it is hard to know for sure until a serious offer is made and we get an idea of what his vision for the club is and how he plans to finance both the purchase and any investment. Ineos and Sir Jim are going to approach this as running a business so they will not pump a single penny into the club that they don't get back. This is not necassarily a bad thing, it can be done sustainably and the club can be placed on a solid financial footing where it is self sustaining with its own revenue but the intital cash injection has to come from somewhere and the devil will be in the details.
I will hope for the best if he comes in with a real offer provided it addresses the issue of clearing the debt and investing in much needed improvements to the club infrastructure. I doubt though that a bid will actually materialize. The stunt with the bid for Chelsea in the summer throws his credibility into serious doubt because it was literally a stunt, a bid made outside of the process and after the deadline designed to grab headlines. Sir Jim himself has stated he wants to buy United and has also categorically on the record said he has no interest in buying United in the space of a few months and is now interested again. I think he is a fraud and until proven otherwise I will hope for another bidder.