Compared to the other budget providers (Easyjet, Flybe [who frankly, aren't even budget prices]), they're miles ahead. The Easyjet routes I used to fly regularly were late every single time, and a member of airport staff told me ~50% of Easyjet flights were delayed in that particular airport. While Ryanair is certainly super basic, and they take every opportunity to sell you tat, they've been far more consistent and far cheaper than the alternatives in my experience