Serre Chevalier is not a ski resort par excellence but a valley with several villages that overlap within the same ski area. In terms of skiing, it's interesting; the area is large, but this means a lot of connections are needed to go from one end of the area to the other. However, it remains much better than Sella Ronda in my opinion.
As for other activities, since there isn't really a resort offering the comfort and après-ski one expects from a major ski resort. The restaurants are average on the slopes and in the villages, and accommodation is mostly in apartments, with the hotel offer only starting to evolve.
The proximity to the city of Briançon is an advantage for amenities that are not necessarily found in the larger resorts. Also very close to the Lautaret pass and La Mège, one can find international level ski touring and off-piste.
In terms of price, it is still very expensive for this type of resort, both for the ski pass and for extras. I recommend it for good to very good skiers who come mainly for skiing. For others, I am not sure that the offer meets the expectations of holidaymakers.