Caters to snowboarders and unsupervised kids and teens. Sometimes the place is literally crawling with them. Many kids are dropped off there for the day, and on weekday afternoons several buses full of kids arrive.
The mountain itself has a 'big mountain' feel. 1000' vertical and some reasonably long runs. Disregarding 'upper', 'lower', 'connection', and other designations there are 7 runs (plus 2 more in the beginner area). There is also a large board park including a halfpipe.
Weekday mornings and early afternoon skiing is a great experience at Wachusett. Also, 100% of trails are lit every night until 10pm. Avoid weekends if possible or you may experience a new definition of the word "crowded". You cannot even find room to ski on the black diamond trails because of all kinds of kids 'pizza' wedging down them or snowboarders sitting across them.
Don't get me wrong - Wachusett can be a great place to ski if you time it right. I ski there often and have had many great days there, but have also left after the the first run because of the crowd and skied-off conditions. Fortunately, Wachusett will give you a raincheck if the conditions don't meet your expectations and you turn your ticket in within the first hour.
One other thing - on busy days, the lodge and dining area is crammed full of bags in every nook and cranny, and on and under every table. Very difficult to find a place to sit and eat.