I have had my share of not-so-great experiences here (including a raw salmon burger!) but I keep coming back because I really enjoy this place.
I don't like spending too much on lunch, so I almost always come on a Friday afternoon for their vegetarian lunch special (veggie burger, fries/soup and a soft drink for $10). Carrots and celery with dip is provided on every table every day of the week as well.
Their veggie burger is freshly made with oatmeal and soy, but usually does not stay together very well. I eat it with a knife and fork most of the time. I almost always get it with sauteed onions, jalapenos, salsa and tzatziki, and I usually choose the soup and a Diet Coke. I actually wish their portabella burger was used in a special because I prefer it to the normal veggie burger.
It is never too busy on vegetarian special day so I don't find it too loud, but during the evenings carrying a conversation is a complete write-off.
Overall the service is friendly and professional.
I like W Burger Bar if I'm by myself during lunch. It's a good place to watch sports or read a book, as long as it's not too busy.