I read it in trade about a year or two after it came out. I thought it was pretty good. I didnt much care for him after his being shoehorned into New Avengers. I thought he was sorta interesting in Dark Avengers but I stopped reading that book after it crossed over into X-men. Seige was terrible and I'm not sad to see him go.
I think the Sentry started out interesting but was run into the ground and when they finnally killed him it was a mercy killing.
I enjoyed the first Sentry series, but it just seemed like Marvel had no ideas or plans for him after the sereis he was just around.