I completely feel that AJ is *THE* Goddess of all Disney food knowledge, and honestly you will rarely find me disagreeing with her. So I'm just going to offer this. The DFB review is dated Dec 2010, San Angel Inn had a menu change in July 2011. Here's a story about it from Disney Parks Blog.
http://disneyparks.disney.go.com/blog/2011/07/new-look-new-authentic-tastes-at-san-angel-inn-at-epcot/
I was curious as to what my full opinion was so I went back looking for my journal of the meal. I went around October 7th, 2011. I wrote the snippets below. I also made a note that someone else I was talking to said that timing is everything there and if you go when it's less crowded it is much nicer. So.. still a mixed review and I'm rambling because I'm bored at the moment.
Here are notes I took and some pictures because like i said BORED:
"All cocktails have Tequila, only serves sweet tea"
"For an appetizer, I ordered the Tacos de Chorizo con Papa, which was the highlight of my meal. Part of the new menu these puffy fried corn cakes were topped with chorizo, fresh salsa verde, queso fresco, and sour cream. Delicious, and I thought enough to be a meal on their own."

"tough steak"

My companion thought that his meal was "good but nothing earth shattering"

My final thoughts were "I had hoped three things from this restaurant. I hoped the meal would be quiet, romantic, and air conditioned. Ultimately, it was air conditioned. The food was good enough, but it was so dark and really crowded, the service was spotty and I was pretty happy to leave. "