It would be much worse if the weep hole wasn't there and the oil filled the left side cavity without giving any outward sign that the seal has failed. The first evidence of a problem would be seizure of the engine.Left side oil seal would be my only real beef. Other bikes have the decency to spit extra oil out the air filters; this one blows out an oil seal. Not only that, the engineers designed it that way, even including a weep hole so the oil could escape when it happens.
I don't believe Honda intended this seal to blow out since it becomes a pretty dangerous crisis when it happens. Aside from the loss of oil overboard you have the potential for it to get on the rear tire with very negative results. They did want a normal seal failure to be evident as soon as there is any leakage as indicated by the inclusion of the weep hole.
My guess is that the problem arises because of a weak crankcase vent system design. Perhaps the hose is too small, or the passage from the crankcase can become choked with oil too easily. The 360 degree crankshaft design results in a lot of air pumpage in the crankcase vent system which adds to the normal piston blowby gas that escapes through this system.