I've been frequenting Lizzy's since they opened, and have probably sampled 80% of the menu. The lunch portion of fish and chips is VERY generous for the price - one of the best lunch deals I've seen downtown. Don't let the signature menu item fool you, there are plenty of non-fried choices available if you're looking for something lighter. Desserts are also very, very good.
Long story short, give it a shot. It's a unique restaurant downtown, and I always feel good about giving my money to the people that run this place.