2.5.1 was a necessary update as it addressed
a critical PHP exploit with all previous versions that allowed remote access to your site(s).
I bet if you had some 2.3 or 2.5 sites get hacked (defaced/tagged), but the sites you had upgraded were left intact, you may have a different view about 2.5.1
Personally I will take security over simplicity ... but what do I know?
