Once again, sometimes you have to overpay in free agency to get the quality player. Antonio Smith is a quality NFL starter and with the way the draft is looking, there probably would not be a DE worth taking in the first two rounds. Signing Smith helps us a ton. It takes the pressure of drafting a DE off of us, and we can focus on one of the more "sure thing" players like Cushing, Matthews, Raji, Jenkins, etc.
Obviously, there are not any true sure things in the NFL draft but what I mean is these guys seem more NFL ready than Brown, Maybin, and even Orakpo. I think you are simply trying to not get your hopes up so you don't get let down. I strongly believe come the regular season you will be happy with this pickup.