Not sure what you mean by LDS genealogy.
I use the LDS site for their index to parish registers, but try to avoid submitted entries (I think that the ones on the new site are all extracted records). In both cases I like to verify the info, either by being able to view the record myself (scan, photocopy, fiche, real thing, etc) or by a kind RC'er checking the register for me.
I don't trust anyone's online tree (genes reu, anc, etc) unless I can verify each event for myself. Anc is well known for people having "incorrect" trees. The best thing you can do is make sure your own research is as accurate as you can and document all your sources 0 for even the tiniest notes.
I'm regretting not being meticulous in documenting where I got certain pieces of info from in the earlier days of my research. At the time I thought "I'll remember" or "it's obvious" and now months/years later I'm left wondering "how do I know that?" and having to repeat my research to re-confirm things.