Grand Arena matching leaves me flabbergasted

Same here.. The skill rating idea is flawed. If they lost due to not participating in a round, they didn't lose based on skill. An easy way to clean this up is to penalize those who miss a round (or all rounds) by not allowing them in the next GA. That would force those with high GP to play the match or just sit out.  You score a zero ( no attempts) , you sit out the next one. The result of this would remove high GP players in lower tiers. They would be forced to move up to a tier that they belong. Those with lower GP  would compete against lower GP that are closer in skill. That would increase the skill and reduce lopsided matches. Those of you who say "its better than it was,  please stop covering for CG". This is not a good match making experience.