There's a lot to agree with in all these posts. In the ideal world you should use the largest format possible for the subject and conditions. Sometimes that's 11x14; sometimes it's 35mm. And, yes, I appreciate the difference even between a 4x6 print from a 100 speed 35mm film vs. the same 4x6 print from a 400 speed 35mm negative.
To me, some of the most impressive photos I've seen are large format pictures of subject that most of us would have used a smaller format for, e.g., people pictures.
Many of the photos taken with large format have a presence that only a contact print seems to provide.
This approach is certainly not for all subjects. In fact, and especially on this forum, I think we often ask the question backwards. We ask, "would this picture I took with my 8x10 look nearly as good if I took it with my medium format or 35mm?" (of course it wouldn't!) But I think the question we ought ask ourselves more often is, "Craft aside, (admitting that is a real big aside) why bother taking this picture?" A great picture taken with a 35mm camera is a great picture. (Usually because of emotional content.) 8x10 "craft" prints often have no reason for being other than craft. Would they have any merit if taken with a 35mm camera?
I think we need to strive to take pictures that would be good irrespective of the format used, otherwise it's more self-therapy than communication.