Worsening glitches and gameplay seem to be a reocurring theme in EA sports games since they started only caring about the ultimate teams mode.
Lack of competition. Fifa was the least worst game for the longest time, because they still have PES pushing it. Now that PES is sort of floundering, Fifa is going the same way. The NHL game hasn't been good in ages, because there's zero competition. Madden hasn't had competition in years either.
Notice how they stopped making NBA games since 2k is crushing them?