I’ve been thinking a lot about all this and, not sure if you’ll agree with me but this is my conclusion. I think it’s probably important to differentiate between:
1) Modern Orthodoxy as a Hashkafa; and
2) Behavioural trends within the MO community.
Let’s take No.1) As a Hashkafa, MO differs as far as I can tell only regards to 3 points:
a) The Mitzva of Yishuv Eretz Yisrael (perhaps more relevant to Mizrachi)
b)The concept of Daas Torah
c)The value of learning Torah vs. Secular study for its own sake.
I don’t believe any of these issues create in and of themselves issues of apikorsus ch’v although the last two possibly can lead in that direction if taken to the extreme.
Let’s have a look at 2) – Behavioural trends. Well this is just a matter of fact. Within both the MO community and the Charedi community you have attitudes ranging from respect and self-sacrifice for the Halacha to a don’t care attitude. Now it’s a question of percentages – in which community is there a larger percentage of families that genuinely care for the Halacha and Torah values and not just for show. I’ll leave this question open because I don’t know the answer.