I know Keystone, Winterpark, Copper and Steamboat. For an intermediate skier I would say WP/MJ is the worst of them. WP is for beginners. And in MJ the lifts do not connect well at all, you need to paddle to get to the chair and there are almost always dead spots, very bad for snowboarders. I have not been there this year so I don't know the new lift.
I still go because the lift tickets and lodging are not as high as other places although the trend is more and more expensive every year.