Mammoth has a scale and season-length story that few California resorts can match. It can be snowy, sunny, windy, sprawling, and brilliant, sometimes in the same trip. The mountain isn't always simple, but when it's good, it feels like its own western ski universe.
The spring case is especially strong. Mammoth can keep skiing meaningful long after many resorts have shifted into memory mode, and the high-elevation terrain gives it a different calendar than the average ski area. That makes it valuable for people who want winter to last.
The mountain can also feel awkward. Wind closures, long traverses, spread-out base areas, and storm-day logistics can complicate the experience. Mammoth is best when you give it time instead of trying to force a perfect single day.