My favorite Chinese in the "area" is Sichuan Gourmet in Billerica. I like them because their sauces aren't just sweet goopy overuse of corn starch like so many places. Plenty of sauces are supposed to use corn starch but it seems most places go way too heavy and add too much sweetening to appeal to American tastes.

Locally, I'm actually a fan of China Star (the one in the Acre) but I only ever order two or three dishes. I haven't been in years though so can't vouch for consistency or if they're even around.

If you want to expand beyond Chinese, check out Cambodian food at Peephuptmei just west of Cambodia Town (they make a fish dish called Ah-Mok which is insanely delicious), and Zabb Elee (Tum Kao Pun is a sweet-spicy cold noodle salad that is incredibly addictive) a few blocks away for Laotian. Fantastic places.