Nowhere on earth does 50% of city look like that. If anything a larger portion of Indian cities resemble that than many others on earth simply because India's commercial real estate market is pretty huge. Problem comes in general architecture of other buildings in surroundings that make subcon cities look shit.
A european city for example without any Grade-A offices, hotels or mall will still look more appealing due to general architecture of all other buildings, while cities in India will have big business parks, malls and all with rest of the buildings being ugly brick/concrete blocks making the entire urban area appear shitty, simply because much of the Indian population can't comprehend building aesthetics. Only Himalayan states seem to comprehend that.
And no, not even 0.1% of entire bangladesh is like that.