PUBG is a technical mess (but getting better). However, it's a marvel of game design, especially if you've spent more than a few hundred hours playing. The design of the new map (Vikendi) is insanely good (save for a few issues with loot spawning) — in size, topography, speed, etc.

They've been able to capture the realistic military style sim, but without the massive player overhead required to learn and be good at those games. The gun mechanics are some of, if not the best I've ever played.