Suspension is great if you are on very rough trails, but I personally have never seen the need for them on any streets or roads, or paved paths regardless of conditions. Almost as effective, but much simpler and cheaper, is to get a fatter tire on the front.
Also, many less-expensive susp. forks are pretty poor and don't actually offer too much in the way of added comfort or control. Bike manufacturers iclude them on a lot of hybrid and city bikes because it is a feature that many people are looking for but don't realize offer little benefit.