From what I remember, M12 was the last game that had decent stats.
In Madden 13 the qb stats were inflated because qbs very rarely got injured so most teams would only use one qb the whole year. Each team would have at least one qb with 20 or more passing tds (which is also unrealistic). Also, this was the game with sim scores like 54-45 or 81-7 on a regular bases so that also inflated the stats.
M25 sim stats were very similar to M15 from what I've seen. I simmed a few seasons over the last couple of days and they were low.