My experience with Meteor is almost zero, but I've read articles about it and its documentation, so I'm talking about by my own experience... I get skeptical when I see a solution promising to solve your problems easily. There is always that moment when you need something more specific and is already implemented by that solution in such a way you can't change it. It sounds like MS Access (in its own proportions).

Probably developers feel a lack of faith on Meteor because of a all-in-one solution like that.

For example, I'd really consider using Meteor for a web site, blog, simple web applications, but not for a complex information system (at least by now). Probably I'm wrong, but this is the way I feel.

The lack of success cases about Meteor being used in big apps doesn't help much.

I think many developers are scared away by the nature of Meteor, since it's a complete toolset which doesn't always play well with existing tech. Fortunately they're working on that part, doing stuff like making Meteor work with Angular.