UK has airline-style pricing that goes up extortionately as seats run out, making it prohibitively expensive to use. It's also frequently late and/or trains randomly cancelled, although you can plan around it, you end up 1hr+ late on most long journeys.

On the plus side: local journeys are great. Delay Repay means you get up to 100% of your ticket back if you're delayed. If you cannot make the last train due to delays, they're obligated to get your home by bus or even by taxi. Train stock is (in my area at least) new and very comfortable. Views are good!