there are rare examples for which this happens. if you believe you are the next Eric Kandel, be my guest. Most of cell/mol papers, though, are basically irrelevant. you'll know once you actually do a few years of research.
There are interesting things in every field. The more important question is, is neuroscience more or less interesting than most of the other fields. This answer tends to be true. Not EVERY project, however, is interesting. In fact, at least 90% of projects are boring. Just because your "calling" is a particular field doesn't mean that you have to be enthusiastic about everything in that field. Similarly, just because your "calling" is something, doesn't mean that you'll be good at it. Many neuroscientists are not qualified to do neuroscience and produce poor (but perhaps flashy) research, and yet they are unwavering in their "scientific curiosity". I think that kind of "calling" is a waste of NIH money and damaging to scientific progress, and this way of thinking is one of the key differences between a newbie and a professional scientist. Professionalism in science requires a realistic assessment of what may be interesting and what is achievable, what is boring and what is fundable. A large part of science is not driven by that inspired drive to discover something wonderful, but by an insipid drive to flush out a vague minute idea with perfectionism. By making science a "calling", it is implied that somehow these clearly boring work is devoid of value.
If something's truly your "calling" you'd do it even if it's boring. 😛