PY – Yiddishkeit is not unpalatable. If a Jew finds it to be so, the problem is with the Jew, not the Torah. Millions of Jews worldwide love being scrupulously Torah observant, love being obviously Jewish, and do not want to hide themselves among the Gentiles and compartmentalize their Yiddishkeit.
The Reform movement was not reacting to speaking Yiddish, they were attempting to erase the differences between Jews and the surrounding majority society they lived among. Do you know that originally Reform Jews wanted to move Shabbat to Sunday. They wished to stop eating kosher in order to go to their Gentile friends homes to eat. They wished to hide their Jewish identities in order to mix more easily. To see the halacha as The Problem, something that divides Jews from each other and from the Gentile society – is 100% wrong.
I am not sure if the whole Modern Orthodox movement is a slippery slope; I know some MO Jews who do not seem to be on a road of less and less observance, but others do, and other MO movements such as Open Orthodoxy (YCT) do seem to represent a slide away from true Torah observance.
Again, I cannot stress it too much that as individual Jews, all should be embraced, but when discussing official movements, e.g. Reform, Conservative, liberal MO – they can be and should be criticized to the extent they have denied the Torah.