This thread is pretty funny.
It's pretty obvious why hardly anyone would choose City University over HKU, HKUST, or CUHK. It's got a bad reputation in terms of its intake, teaching qualification, academic standards, and output. Among the ex-polis, Polytechnic University is the better one, and the only reason why CityU is higher on the tables was because they spent all their money to hire good researchers (who don't teach undergraduates) to produce lots and lots research. You won't be unemployed after CityU but that's just because Hong Kong's economy is great and there's a virtually non-existence unemployment rate, but you're definitely disadvantaged, especially in the business field, where people are likely to screen you out for not being from the 'Big Three', or for having graduated from a local university. In fact, they didn't even exist in Oxford's system for you to select which university you did your degree at.
Also, their students complain about the need to share space, in lecture and elsewhere on campus, with associate degree students all the time. Not to mention the constant (justified) shades they suffer for basically being a school in a mall.