I am an English teacher in the elementary school. For me, I think the pronunciation is quite crucial at this period. Because they are beginners, I think they must learn the right pronunciation, or later they will not change their mistakes. Mostly, I will correct the mistakes made by most of the students, and they will be conscious of their mistakes. They won't feel hurt because the faults are made by most people. For individuals, I won't correct them unless the pronunciation is quite weird. I will make them repeat several times until they find the mistakes by themselves. If they don't find out, then I will say the right pronunciation and make them repeat again. One point is quite important, that is, don't make them feel frustrated and hurt their self-seteem. If they don't make huge mistakes, I will just pass it by and ignore it. After all, if a person is always corrected when he/she tries to say something, I think he/she is tend to give up.
Hope this helps!