The sport of boxing is great, and when you have epic clashes (See Bivol/Butterbiev 2, or historically Ward/Gatti) it can be as exciting as any MMA fight. The problem is boxing has so many problems that it's hard to stay a tried and true fan.
A lot of the fights there's problems with engagement (A LOT of fighters afraid to lose, because a loss will screw them, and re-structure their careers), too many tie-ups, too many promoters, truly HORRIFIC reffing and judges calls (LEGIT corruption, as opposed to inept reffing/ judging, which happens in MMA, but not nearly as much). Not to mention (for all of the above reasons) the best rarely fight the best. It's hard to get psyched knowing that some of the best fighters will either never meet, or meet once their outside of their competitive peaks.