Jameson House definitely adds something to West Hastings. That part of Hastings, which includes the Marine Building and the old Royal Bank Tower has a mature, "established" feeling to it, rare in Vancouver. Even though the bay windows are very "ultra" and the sides and back are average, I think it adds to that "mature feeling" Hastings has, and that the rest of Vancouver could benefit from.
Just an off-hand observation from an overseas resident who was born and grew up in Vancouver, and still loves it.