I agree. Current day La Costeña on Middlefield is nothing to write home about.
La Bamba had the best meat; just a plain pollo burrito was a thing of glory, and their carnitas was transcendent. But La Costeña was where it was at if you wanted a burrito with stuff in.
They also have a photo of their "world's longest burrito" record in the store, and on their website: