Sorry if this is a duplicate, but I couldn't really find if it was reported in this form or not.
The patterns have a big problem: if I for one want to remove zmd (heh, the usual thing, but could be any other package) from my system, it complains that it is needed by the base pattern, and the kde pattern and if I just select to delete the patterns instead of ignore the conflicts (which I don't like) and I apply the changes, I will end up with a system without almost no packages installed. ;-)
Luckily the problem is solvable if I set to keep the packages on the installation summary page and select again to remove what I want, because at this point the patterns are already selected. My complaint is that I have to do this manually. The good solution would be to deselect a pattern if I remove a package from it, but *do not remove* the other packages belonging to it. If you say this means the pattern is not complete anymore and all the other patterns depending on this one are not complete either, I don't care if they get unselected too. Actually it might be reasonable to do so. But do not remove any other packages that do not depend directly on the package I removed. 
BTW, I have to confirm deletion of every pattern twice in the resolver dialog...