It's not just Destro, Order also has the same problems and sometimes the random group generator will add its own, putting all healers in one group and all tanks/dps in another ...
We had one of those yesterday, lost 500-0 against very good Destro ... lost another one 500-4xx after we were winning 4xx-2xx. There was a lot of artifact swapping, either people is getting better in Mourkain scenario or they just don't value artifact defense enough - the only time I got it, I was killed without receiving a single heal which somewhat explained me why we already won it and lost it so many times in the same scenario ... but you can't really blame healers when there are so few of them.
We had one of those yesterday, lost 500-0 against very good Destro ... lost another one 500-4xx after we were winning 4xx-2xx. There was a lot of artifact swapping, either people is getting better in Mourkain scenario or they just don't value artifact defense enough - the only time I got it, I was killed without receiving a single heal which somewhat explained me why we already won it and lost it so many times in the same scenario ... but you can't really blame healers when there are so few of them.