Other sports are extremely difficult to analyze with stats. They're far too dynamic, and have way too many variables. How can you tell if a QB avoids throwing to a receiver because the CB is amazing or if the WR is garbage, or some combination, or it's a good WR with a sore hamstring... there are a thousand scenarios that all affect one another and it just makes it damn near impossible to nail down with stats. That's what I love about baseball, how most things can be analyzed in a vacuum and be meaningful. Sports like basketball, hockey, and football are such that the same player could be a superstar on one team or a scrub on another team. The situation and role of a player matters so much to his success. Maybe certain areas of other sports can be more deeply analyzed. It's worth looking into I guess.
With baseball it's so beautiful. There will always be debate about what stats are phony and what ones are revolutionary, but the debate is one of the most interesting parts, at least to me.