From articles and sites found on the internet, it seems as it is a widespread problem with their network and both Sprint and Apple are trying to work it out.
I'm in Ohio as well but my speed depends on location and time. In some areas around Cincinnati, such as West Chester, there are dead spots where it's useless without wifi. So I sympathize with you if it's like that. In my area it's not bad. Plus I use wifi anyway so it's not really an issue, and at night my 3G speed triples.
I have the direct sprint Retentions line so you can call sprint if you are having any issues 1 (888 )273-9460. You can call and demand they send a technician to your area and observe actual network speeds. That's what I did. Don't forget to get the rep's name and employee #.