I like Zack Ryder and all, and a part of me really wanted him to become United States Champion, but sometimes I just can't bare to watch him. As Hatred said, he oversells and overeacts in his segments, but even then that's definitely two things that shouldn't have gotten him to the position he used to be in. It could have been too early to give him the United States Championship, something I think the WWE will realise in the coming months and will act appropriately.
My guess is Ryder will still be US Champ past Wrestlemania, but not too far. Maybe sometime in April or May he will lose it, hopefully to Swagger. That guy has the look, is great in the ring, and has decent mic skills, but he's booked to look so weak. Imagine Dolph Ziggler as WWE Champion and Jack Swagger as United States Champion, both of them still alongside Vickie. That would make Vickie look like a very credible manager as her credibility has dipped ever since her split with Edge.