Meribel is located between Val Thorens and Courchevel, putting it at the heart of Les Trois Vallees, the largest ski area in the world. Naturally, this provides the area with direct access to more terrain than most mortals could ski in a lifetime and unbelievable views from just about any point within its boundaries.
Whereas Val Thorens seems to focus a bit more on the skiing alone and Courchevel puts emphasis on high-end lodging and fine dining, Meribel is focused on the younger generation and is the nightlife epicenter of the area. As we moved around the resort it seemed we there was always a party or concert within arms reach, even while on the slopes (i.e. la Folie Douce). This area features every kind of nighttime entertainment and manages to spread it out so you are never far from the party.
Before I scare off anyone that values their sleep I should mention that the village does spread out both up the slopes and away from the village's core, providing a number of lodging options that sit outside of earshot of the aforementioned entertainment options. It also includes a plenty of family-friendly dining options and activities. The final thing worth noting is the area also features a number of chalets at far lower rates than are available in neighboring Courchevel and a great option for families and groups looking to all stay together at a more reasonable rate. I personally was very surprised by the size of these homes, along with their amenities and beautiful modern French country décor. These homes feature full kitchens (and private chef options) and do sit far enough outside of the core that guests can completely ignore the village area if so desired.
All in all, I would characterize Meribel primarily as the young person's access point to the largest and widest variety of terrain in the French Alps. It can work for families and couples though Val Thorens or Courchevel are generally going to be safer choices.