Lucas is great if you work downtown and you're having a rough day that requires working through your lunch break. Call, place your order and your food will arrive within the hour.
It's the only place downtown that has been consistent with delivery times and quality of food (outside of ordering pizza). It's not the GREATEST lunch spot in the downtown area, especially with the emergence of new, and fabulous, lunch spots (like Le Thai and Eat...) but it's definitely my go-to delivery spot.
I almost always order a salad (greek or caesar) and have never had any problems. Salads come with dressing on the side and a bread roll. Really tasty, in my opinion. My only qualm is they tend to over-charge, especially if you want to substitute anything or add meat to your salad.
I've ordered the Reuben and BLT in the past - not bad! They've got decent french fries and one of my co-workers really loves their empanadas.
The menu is huge so you shouldn't have trouble finding something that catches your eye. Although, I advise against ordering any of the soups because they lack flavor.
Also, there's an AYCE salad bar if you chose to sit and eat rather than have it delivered. I've never actually been to Luca's, but this is what I hear around the water cooler!