CTR: Rav Aharon Kotler ZT’L, and Rav Schneur ZT’L after him, would under no circumstances even walk into YU. Rav Elchonon Wasserman ZT’L also, when he came to America in the ’30s, was invited to speak in YU, and he refused to even walk in to the place. (The fact that Rav Moshe went into YU does not show he was not opposed to it, but rather that even if he is opposed to it, that doesn’t mean he may not enter it. Different Gedolim had different ways of expressing themselves in these issues.)
Rav Aharon Kotler ZTV’L, in Mishnas Rabi Aharon (Vol. 3, Hesped on the Brisker Rav) states that the essence of Modern Orthodoxy is the same as the Reform and Conservative. That is, change Judaism into something that more people will be willing to accept.
Rav Shimon Schwab, Mitteilungen, Bulletin of Khal Adas Yeshurun April/May 1989:
“Sometimes the Modern Orthodox halachic foolishness which is flirting with the anti-Torah establishment, may border on heresy. This is all part and parcel of the spiritual confusion of the dark ages in which we happen to live”.
“However, in addition to the legitimate shitos we have discussed, there is yet another, more modern version in vogue called “Torah Umaada”. Apparently this is identical with Torah Im Derech Eretz, especially since both claim a belief in the priority of Torah over maada. Both seems exactly alike, but like two left gloves which cannot be worn together, they don’t fit!