I agree with what you are saying, except that the Maritime Centre was actually a product of the viewplanes bylaws and was designed at such an angle so as not to interfere with the viewplanes bylaws. I remember this when it opened and when it was expanded from 12 storeys to the current height. It had a great retail component also, with a food court on the lower floor. This building had a very impressive interior lobby back in the late 70's. (I haven't been in it since). I actually like the appearance of this building.
There are some mistakes in the Halifax area but these aren't simply because of highrises and in some cases a much better development could have been built if higher buildings were allowed (I don't think that I am disagreeing with you here?). One example is Scotia Square; this could have been one 30 - 40 storey highrise office tower and built similar to Founders Square so as to incorporate as many of the older buildings as possible and to keep the street grid. The Cogswell Interchange never should have been built. If only someone could go back in time.
A big part of the problem in the Halifax area is that developers can't charge enough per square foot to build elaborate buildings. In spite of this Halifax has several great developments (in my opinion - 1801 Hollis, Purdy's Wharf, Founders Square and others).
One way to overcome the problems that you have specified is to have more mixed use buildings - hotel/residential/office all in one. However, in my opinion, the new convention centre should be built close to the city attractions that visitors will want to see. Perhaps a residential component should be included though. I am not in the construction industry so I can't really comment on the point about engineers and architects but both have to design buildings based on fire codes and both have to build based on the money available. Also, if everything is designed by architects then you might have a lot of these buildings in downtown Halifax -
http://www.flickr.com/photos/digitalparadox/2618110979/ - source Flickr - DigitalParadox . This is an interesting building but it wouldn't be allowed in Halifax (fortunately). There are some great buildings in the Toronto area but there are also a lot of very unsightly buildings. Architects and engineers have to work together to come up with buildings that will be acceptable in the Halifax area based not only on architectural design but economics and regional tastes (maybe this is what you have already stated in other words). All in all, I like the new convention centre design.
PS: I can't type fast enough. Once I typed this post in, I saw that the Maritime Centre was already discussed.
This bothers me (
http://www.savetheview.ca/ ). It states that 91% of the population is against the convention towers and shows people looking off the citadel hill supposedly at the harbour. If it were me up there I would be looking at the downtown buildings. Many of the pictures that I have seen on Flickr that are taken from the Citadel are of the downtown buildings and are described as such.