The modifier "rationalist" is pretty unnecessary - I'd just ask for "Opinions on Nietzsche". There seems no good reason for putting it in and several good ones for leaving it out. As a semantic point, it sends off dark arts alarms when you ask for the "rationalist opinion" on Nietzsche. While I certainly think that, in this case, it's possible to rationally evaluate Nietzsche, asking for consensus of "rationalist opinions" is going to get very cultish - it implies that you're not a rationalist if you disagree. And there shouldn't necessarily be a "rationalist opinion" on everything. There are some things that aren't issues of rationality - like asking for the "rationalist opinion" on what the best flavor of ice cream is.