Its pretty simple, really.
One, gigantic, unrealistic boobs arn't attractive. They are creepy self-parody. Give me a real girl with a nice body over some freaky vagina on a stick with 40 pound flesh blob growths coming off the chest. "Big breasts are nice" does NOT translate to, "Bigger is always better". We have passed the realm of idealism, and into the realm of disturbing. But this isn't the PRIMARY answer.
The primary answer is that DOA style cheesecake is completely fine in and of itself. Appealing blatantly to the shallowest of sex appeal is not inherently bad, and earlier versions of Kasumi are very pleasant to look at, and that's great. The problem is that we have set blatant sex appeal as the default. Every damn female character needs to be impossibly hot, and that denies females the chance to have female characters they can enjoy without having to consider there sexual aspects. We complain when every male protagonist is a gruff, scruffy, white skinned, brown haired, wise cracking mercenary type, but female characters across the board are much more narrowly defined.
The reason DOA is catching flak is because, well, how do you address this problem? The problem is that this female trope is universal, but standing on a hilltop and yelling, "Hey, 90% of you guys need to cut that shit out" is going to leave everyone assuming that they should be in the 10%. Especially because sex does sell, and even though the industry would be better off and even more profitable if female characters were treated more broadly, the 10% stand to benefit the most. The industry may want to change, and stands to benefit from changing, but they benefit even MORE if everyone else changes, and they don't. It's prisoners dilemma, but with tits.
So inevitably, the only apparent course of action is to question every individual ip, do you REALLY need that big a set of breasts? In theory, by asking this question, you weed out enough pseudo-porn that the remaining pseudo-porn compliments the medium of video games quite nicely. The problem is that criticizing individual IPs is not actually logical, its just the only option out their. Personally, I say that the DOA series are so in love with breasts, they have earned there position as distributors of unrealistic, shallow females.