To be honest, the reason I don't like MMA is that it's just all over the place, boxing is an art. You can beat someone much stronger then you in boxing with skill, in MMA the stronger bigger guy wins. And many of these guys seem to be on steroids.
Because grappling is an intergral part of MMA, it's true strength and size helps alot. But size alone isn't enough. In MMA the heavyweight class is 205 lbs to 265, and according to fighters only magazine the smaller man has won half the time.
If you want the most recent example check out Brock Lesnar vs Cain Velasquez. Brock outweighed him by approx 30 lbs after the weigh ins, and he got his ass whooped! Simply because Brock's skill level is below Cain's. If 185lbs champ Anderson Silva (best P4P MMA fighter) was a heavyweight, he'd clean out the division without breaking a sweat.
Also if you watch the first UFC Royce Gracie was seriously outweighed by his competitors yet made them all quit to become the first champ.
But the general rule in fighting came into play once competitors started training seriously - when 2 competitors of equal skill fight normally the bigger, stronger of the 2 win. That's the reason why there are weight classes in every combat sport on the planet.
I know I'm not gonna change your mind though - you dislike MMA for the same reason I like it, and I dislike boxing for the same reason you like it, lol.