My husband and I had the displeasure of eating at Beana's about 9 months ago. Unless they've changed their chef in that time, the food is below mediocre. The food is so far from authentic that "South of the Border" is a truer experience. The first giveaway to the bad state of affairs was the salsa - the ketchup variety. The Rice & Refried Beans were arrid and everything else was basically congealed glop.
If you're looking for great soul-satisfying Mexican, go a little further south and try Tacqueria "El Poblano" on New Street in New Brunswick. If you don't speak Spanish, bring someone who does -- or at least know menu Spanish and how to recite numbers.
Great items on the menu: Enchiladas verdes de pollo [chicken w/ green sauce & sour cream] (blistering and orgasmic); Tamales con queso (spicy with jalepeno - weekends only); Huge Burritos (especially con carne de puerco [pork]); Arroz y Frijoles (Rice & Beans) - mouthwatering, along with just about everything else!
If you're really looking for real -- this is the place!