Part of the issue is that modern games are usually getting fixes right up to release. Pre-release reviews tend to focus on things that aren't likely to ever change significantly, like design and writing.
It would be nice if they gave a summary of issues they saw with a disclaimer that they may get fixed instead of omitting that information entirely.
Microsoft now installs games in an unprotected directory because people were so annoyed they couldn't use the mods made for other storefronts.