Memory Alpha is not always correct.
For instance, see this question that I asked:
Read @N_Soong's answer first and then @Richard's. (In case @N_Soong reads this: it wasn't your fault, it was Memory Alpha's!)
In my own answers, I use Memory Alpha mainly as "further reading" on episodes that I refer to. If I write something like
Geordi found a strange shadow in a holo-recording in "Identity Crisis",
then I will usually put in a link to the episode:
Geordi found a strange shadow in a holo-recording in "Identity Crisis",
as a benefit to the reader, since the plot summaries are very complete at Memory Alpha.
However, I try to avoid using Memory Alpha for primary research. On several occasions in non-episode articles, I have found quizzical statements with no primary reference. At times when the only available information on a topic is an unsupported claim from Memory Alpha, I will include the claim in my answer, but with a proviso that it is unauthenticated and may be purely speculative in nature, despite being presented by Memory Alpha as fact.
In general, I find that Memory Alpha makes for good reading and browsing but not necessarily for good research.