He doesn't tell you everything is amazing. He usually seems skeptical, IMO, which is what one would expect from an old-timer in any profession (wish there was a little more of it in tech). Tells you that L lenses are nice, but he buys and uses non-L because it works equally fine for him (and yes, I know he primarily appears to use Nikon anyway :P). Says this about most expensive things.

I've personally noticed a large difference in the mechanical performance (not necessarily the image performance) of my L v. non-L lenses and thus prefer Ls. I have non-Ls but they get used a lot less because they're heavier, louder, and much slower to focus. This doesn't seem to bother Rockwell which is more than fine; he's probably a) much less spoiled than me and b) working in different environments where these issues are less serious.

Newbies never know who or what to trust. That's part of what makes you a newbie. You just have to come in and start trying things out and figuring out what does or doesn't work in your particular use case, and not stick religiously to random guy's blog if you find those techniques are not working for you.