I don't get the bashing of the BCEC. How many cities have a 500,000+ SF convention center walking distance from downtown and less than 2 miles from the airport? Sure it looks like shit from the top but just about every large building in Boston does because you're taking in the mechanicals. There's nothing earth-shattering about street-level design, but the awning is memorable and attractive enough. And the best part is that BCEC has booked well and done so without killing the Hynes.
If you want to argue that Boston shouldn't be a convention city, fine. But it's tough to argue that the BCEC hasn't been a success (let alone call it one of the "worst" projects of the decade).