Personally, I rejected all of them with the following comment:

> Please don't clutter up the review queues with such minor edits. Wait until you have enough reputation to make them directly.

Minor edits that actually correct a mistake, or fix formatting or improve grammar or even typos are fine. Minor edits that simply remove thanks and leave the rest of the post untouched are just not worth it. Especially since, in many of those cases, there were other, more serious issues wuth the quesiton that were not fixed. 

So, yes, in my opinion, those edits should be rejected since they're not worth filling the review queues with. We can leave them to those users with enough rep to edit directly.