From what you say here, they pretty much suck.
"Suck" may be a bit harsh, but sometimes you get what you pay for. For less than 90 bucks a tire, they are a alternative for those on a budget, and you have to examine the type of riding you do. If you are a full bore , sparks a-fly'n corner killer, they may not be the best choice, if you live in Kansass, where the sharpest curve is still pretty much a straight line , they may work out fine.
My take has always been that the only thing that makes your bike work as intended is the connection between it and the road. Higher priced tires have alot more technology in their make up and for the most part, how well they work in the rain, and how well they stick you to the pavement, and how many miles you can get out of them are always factors to consider.
One also tends to learn the limits of their tires and rides accordingly. I wish all tires exeeded my needs, but it always boils down to a comprimise between long life and good traction.
Many folks think they are already riding to the "limit" but are really only riding to the limit of their tires. The Vulcan is not a race bike, and not really able to "push the envelope" as a well fitted sport bike can, so there is some leaway as to what tires "work" with the bike.