Mods at Madden were quick to close thread that discussed the beta...but we could pose these items that we want testers to look into when they are testing, then provide this feedback to EA.
Here are some of mine (I'm assuming just base gameplay without adjusting sliders as a base case):
Foul frequency. Are you seeing fouls committed by CPU? This has always been an issue with Fifa. If the animations suggest a foul should be called but they aren't called, this should be called to their attention.
Passing precision: are the CPU passes unrealistically too precise? (especially when facing away from receiver or when under pressure)
Success on crosses: good, bad, ugly? Can you score on corners? is the defense winning too many crosses? Is placement of crosses too easy or too challenging.
Defensive teammate awareness: are your defensive teammates being drawn out of position by opponent's runs through the box?