I do recall being impressed by the Maritime Centre when it was first built, mostly because there weren't that many buildings of its type in Halifax. I also thought it was 'neat' that it was built at such an angle as to be minimally intrusive to the view of the harbour from the Citadel (which is no longer a 'thing'). But at this time I am now more in agreement with you on that.
I think it's kind of sad that Halifax didn't keep any of its more elegant and ornate early 20th century theatres. The last one to go, the Oxford, which I believe is being converted into a climbing gym of some sort, was along those lines but somewhat less ornate than the Capitol.
I don't recall ever being inside the theatre, but here are a few pics from the
NS archives:
And a colour pic:
Source
A pic taken, strangely, from the old burying grounds in the early 1970s:
Source
One from the 1930s:
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Source
Additional info:
https://historicnovascotia.ca/items/show/99