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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 wrote (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! . . .”
(Selected Essays pp.160-162):
“Rav Hirsch ZT’L has inscribed two emblems on his banner. One is Torah Im Derech Eretz and the other is the so-called “Austritt”, which means severance, or total and non-recognition of any type of institutionalized heresy, “minus” or apikursus. This is also a resolution not to contribute, participate in, or support any cause which accords validity to the disbelief in Hashem or to the denial of the authenticity of Torah shebiksav or Torah shebaal peh. In other words, “Austritt” states that the Torah is our sovereign ruler, and it makes us independent of all those who deny its Divine origin…
“To summarize, Torah im derech eretz without Austritt is considered treif l’chol hadeios! Even if you call it Torah Umaada.”
The battle against YU by the Yeshiva world is not, nor was it, a simple issue of Halachic or Hashkafic disagreement which can be dismissed as routine if accompanied with the obligatory respect for the opposing view, as per ailu v’ailu etc. Not so. Rather, YU was viewed as a deviant, dangerous, and anti-Torah entity that doesn’t deserve the respect of a legitimate Torah position, even a mistaken one. Rav Aharon Kotler ZTL once commented about Rav Soloveitchik, “He is respnsible for the majority of Tumah in America.” Also from the same Rav Aharon, “He destroyed an entire generation of Jews.” Rav Aharon Kotler ZT’L said many times that he will not enter YU because it is bad. His son, Rav Schneur ZT’L, followed suit. 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.