This explains everything.
Do you ever feel, as a consumer of media, that you shouldn't need to work so hard to like something? And that maybe, just maybe, it's okay to not like it?
As far as I've seen, it's you who are trying, very hard, to find a reason
not to like it. Also, you presumably don't like OT, either, because the Force is used in a similar way there. Sure, it's a bit more deliberate in the OT, but fundamentally, a lot of things still happen "coincidently". You should mind that it's
very, very hard to avoid an unusual number of lucky coincidences happening over the course of a story, especially if you're making a movie (which has a very limited runtime). Star Wars made a point out of it, which I think worked out pretty well. It's a perfect explanation of contrivances and my advise is: roll with it. If you spend the movie looking for a "hole in the whole" (as goes a surprisingly well translatable Polish saying), you're only spoiling your own fun.
In a way, the massive amount of lucky coincidences plays well into the theme of the movie. The Force Awakens. You can see it start doing stuff, much more actively than before. It literally saves Kylo Ren's life (and Rey's souls as well, she was falling headfirst into the Dark Side during their fight) in the end. I think it's actually kind of fitting that it manifests everywhere, for example leading Rey on her patch. It's obvious that she's the new "Chosen One", much like Anakin was. Now, it's true that it is a bit
too obvious. I wouldn't say the movie is as good as ANH. I am, however, willing to say it was a good movie.
The particular instance I was talking about (everyone and everything important on Starkiller being in
a single building on an entire planet) was about the only thing that raised my eyebrow as "lazy" there. Really, they should've taken a train or something, perhaps to the central compound (you know, the one with the view of the big gun) and found Rey there, as opposed to her being in the oscillator building along with everything else. Though this might be less "lazy" and more "Abrams' utter lack of sense of scale", which wouldn't even be the first time in this movie. In fact, my biggest complaints about the movie could be summed up neatly as "No sense of scale whatsoever". From Starkiller base firing, which is somehow
seen across the galaxy (nevermind the speed of light), to it exploding and turning into a star (nevermind the actual requirements for self-sustained fusion, conservation of mass, or whatever).
In the end, you were complaining about things relatively easy to explain using the actual canon (and supplementary material, in a few cases), while ignoring the obvious physics goof with an official "explanation" that raises more questions than it answers. No, the movie wasn't perfect, but it was good. The plot does hold up to an analysis (not only mine, TVTropes people seem to have reached similar conclusions) and the characters definitely have potential.