dont worry, you did not buy junk. I have a jamis ventura comp, the one with carbon seat stays, it also came with carbon cranks. I think its a very good roadbike, good balance between comfort and performance and price. It is more comfortable than most bikes ive tried.
For comparison i have a giant team once road bike, the same one the team once uses in the tour de france more than 10 years ago, i bought just the frame and buitlt up with cheap parts.
The giant team once is a very responsive fast bike. The Jamis is more comfortable but is noticeably slower especially when standing on the pedals during sprinting. I wouldnt say the jamis is slow, the giant is just faster.
Our roads here are not so smooth so I actually ride the jamis more because it is more comfortable.