Soldato
Just like with any form of food consumption: moderation is key.
My personal feeling on MSG is that if you use the proper ingredients you won't need to add manufactured flavourings.
I used to use it for rice flavourings but now use whole/ground spices and tastes much better.
Here's a good blog post on it by my mate Tim (before he made it big )
http://iamaviking.com/2011/01/17/the-war-on-msg/
Just doing press stuff at the moment, but obviously has offers coming in. Going to bide his time a bit I think rather than rush into anything -he's still working at the Euston Tap at the mo!