More cards to lessen the chance of drafting things like holy nova, consecrate, and flamestrike is fine by me. The last one is a huge pain in the ass the play around.
Though, I don't know why you're implying that the overall quality of the card pool has gone down. Sure, dragon synergy is not something you can draft on but that doesn't mean BRM didn't introduce some good standalone cards. The classes that didn't need help didn't get any good arena cards. It was probably purposeful. Except for warrior, they got fucked by BRM in arena.
As for neutral commons, Drakonid Crusher, Hungry Dragon, Volcanic Drake, and maybe Dragonkin Sorceror are all good. Drakonid Crusher is especially good because he makes threatening lethal much easier. I've been able to put many games away by going face then playing him instead of trading minions.