WikiTree is an evolving site, and virtually everything which is added makes it better.
You'll find profiles that have no sourcing at all. Sooner or later, they will.
You'll find profiles with a source like ::marriage records. That's slightly better. Not much (since if there was a date for the marriage, you can already guess it was probably marriage records that produced the date!), but slightly.
When you see a profile like this, it doesn't mean (or shouldn't mean) that somebody thought it was done. It's simply the best that someone could do at the time. And it's ready for more.
When I come to a site where there's a lot of Ancestry.com garbage, the first thing I do is ask whether in the midst of all the letters and numbers there is a clue to better sources for the information. If there is, then what looks like garbage has helped me improve the sourcing.
When you come to a site that looks like it needs work -- and if the only sourcing is ::marriage records, it does! -- the operative question shouldn't be, "what's wrong with this profile" -- asking that will simply create a lot of negative emotions (!) -- but rather, "how can I make this better?"
Virtually everything we do on a collaborative site is to build on something somebody else has done. If everybody else's work was already perfect and complete, we'd have nothing to add!