OP needs to give more context for us to be really helpful. What many of us may consider good/authentic, others will just laugh as ignorance. Is OP from mainland China? Chinese from USA? then what city (I can assure you that Chinese food in Alabama is very different from Flushing, Queens in NYC)? Even with chinese food, there are many kinds of cuisine -- what you eat in Beijing is VERY different from what you eat in Hong Kong. Also, most of the Chinese here (at least the ones in the supermarkets) come from Fujian province so the few authentic (cooked by chinese for the eating pleasure/critical tongue of other chinese) are from there (I posted about one such before).
if you ask me, Barrio Chino / Chinatown is fast food chinese. Ok for a craving of rice and noodles tossed in a wok, but I have yet to find a good place there that makes me say "Yummy" like in Flushing, NYC or Vancouver, Canada (better than HK). I just resigned to go to Asia Supermarket and eat at their deli when I have a craving. At least it's cheap there. I did eat at the Japanese Ramen place on Mendoza Street (in Barrio China) and found it good (but pricey), but then again I am not Japanese so on that one, I may be the ignorant one.
As for PF Chang in San Isidro (and frankly for the ones in San Francisco Bay Area as well) it is overpriced and same or less flavor as the ones in Chinatown. I went there about 4-5 months ago and swore to myself to never enter another PF Chang again unless it's the only place open and I'm starving.
For other asian restaurants, I am told that Osaka and Sudestada in Palermo are really good. Have not tried them though. I've had good Korean choices in Flores/Floresta (though they are expensive, I had to roll the 100s there).
BTW, Yelp has launched in BA. Will be using it to find good restaurants