Variety, excellent grooming, good mix of terrain
Lift line traffic management, parking lot accessibility
Every review is relative and needs to be taken in the reviewer's context. This review is written by an intermediate level snowboarder from the Cleveland/Akron, OH area. I don't spend much time in the lodge, locker room, or any of the other amenties so all I'm really concerned about is the slopes themselves.
Holiday Valley is a nicely sized resort with a little bit of everything. They have excellent slopes that can challenge anyone, and also a number of intermediate slopes that cna give your legs a break but still get your heart pumping. Both times I have been there, the slope conditions were pristine. They groom mostly all of the major runs and do a nice job of keeping bumps and moguls from building up in areas where they're not supposed to be. The Wall, probabably there most infamous run, is virtually useless from a boarders' perspective unless there is fresh powder. I imagine it would be an awesome run if it were covered in fresh snow, but most of the time the face is solid ice and there's little point in trying to navigate it due to the amount of ice.
Weekend 8-hour day tickets are $54 which is pretty reasonable given the amount of skiable terrain and the slope conditions. Almost all lifts are four person and they do have two high-speed chairs with a third coming next season. Lift lines can get long though particularly on the Yodeler lift which services some of the best black diamond runs at the resort. However, the place is big to find another lift with leaner crowds and still be able to access challenging terrain.
In almost every category, Holiday Valley is hard to beat. There's a ton of challenging terrain, excellent variety (the far side of the mountain is buried in a tall pine forest and is a really picturesque area), and enough to keep you busy and interested all day long. Parking is a bit of a drag especially on a warmer day since the lot is not fully paved and can get a little bit muddy. Expect some crowds and expect to wait in line on almost every lift, but the slopes themselves never seem to feel overwhelming packed so traffic control never seems to be an issue.