> Serious question: How do you know if it's right or wrong?
I don't know much linguistics, but sometimes the sound-changes involved seem plausible to me which leads me to trust it ("yeah that makes sense").
When I do follow the references they normally check out. In some cases where there weren't references I did some sleuthing myself and provided them (things checked out).
In another case it seemed that two words should be marked as related, so I asked on the etymology scriptorium ( https://en.wiktionary.org/wiki/Wiktionary:Etymology_scriptor... is their etymology messageboard - I find it highly entertaining to browse through people figuring out a random assortment of etymologies in the same place), and someone took the time to explain to me (to my satisfaction) that no it was just by random chance.
A few other times when I've found problems (last one was some vowel-length inconsistencies for a Latin word entry) I've asked about them, had them confirmed as problems, and fixed them (in the case mentioned, it was reverting someone else's erroneous change).
Also, some people I know who are a lot more experienced with linguistics [still amateurs, but...very highly skilled amateurs] than I am contribute to it.
All of these experiences lead me to have a high level of regard for wiktionary. As said, I'm not very experienced with linguistics, but I haven't gotten the sense that the people running the shop are anything other than competent.
>Ever check cites on Wikipedia? Many of them do not at all support what is written in the article
Dictionary citations of the sort you get on wiktionary tend to be less open to interpretation.