I've done a lot of skiing in Vt. I've skied all the decent mountains starting in the south at Mt. Snow to Jay in the north. But my favorite, by a mile and where I've done most of my skiing, is Mad River Glen. It's not a big mountain. Many of the skiers are deep regulars who own chalets or are part of clubs that own chalets on the mountain, so there is a family feel to it. The mountain is very challenging; the trails are not wide and not groomed like the bigger mountains, so it demands a more than a decent command of technique. There is a lot of "off-piste" skiing, which you have to discover on your own or watch/follow regulars. Keep in mind that many of these hidden gems are last run type of adventures that do not end at the parking lot, but somewhere off the beaten path. These adventures are usually planned in advance and a car is left at the location for the end of the day ride back to the lot.
The lift prices are reasonable compared to many of the others in the state. The food is decent.
Now the downside, which for me wasn't much of a downside, but if you're used to places like Killington could be a dealbreaker:
Gotta get there early. The parking lot is not so big.
The lodge is not huge. We would always take breaks at odd times, such as an earlier or later lunch. Or lunch mid-mountain.
Snowmaking is not a big production. MRG has been known to close mid-week, mid-season just to recover from a rain or warm spell.
thin snow cover that would close a trail at other places is considered a slight inconvenience at MRG.
There is no snowboarding. There is no terrain park (the whole place is a terrain park, actually).
There is not an abundance of seats going uphill (a single and 3 doubles). This, of course, means that there's not a lot of traffic on the slopes.
There are not a lot of creature comforts.
Here's a quick video of Paradise, which for years was only on some of the trail maps: