If the people you are feeling with seem intelligent, you could explain to them that you only get one chance for a first impression and if that first impression is made with an unfinished mix, they are effectively running around giving people the impression that they suck.
If they aren't smart enough to handle that, only give them what they need to hear. for example, if the guitar player needs to listen to what he just played that day to make sure its all good, give him a mix of just that guitar and drums for context.
But if this is a band that you are not in and they are paid up, its not your problem if they take all the value out of the recordings by circulating unfinished stuff. Do your thing, get paid and move on.
I am kind of with an earlier comment, it should sound like something useable in scratch form. Normally what happens to me is that that ever instrument was recorded that day will be too loud in the mix simply because I got used to hearing it that way while monitoring the performance.