Many will argue that refridgerator thermostats aren't good enough either, at least not for lagering. Too wide a temp range before it'll cycle (to save energy).
Real beer isn't meant to be ice cold...you want it in the upper 30's to mid 40's...some styles even warmer than that.
I run my keg freezer at 42F
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10