I guest this is ckd assembled in Malaysia.
I drive a 2nd hand 2012 Polo sedan (bought in 2016, CBU from India) and like the stable ride. This is quite reliable since it is not turbo charged and has an Aisin (Toyota) gearbox. Expect more expensive spare parts unless you diy some maintenance yrself. I do my own oil & filter change. Can get parts online or go to outside workshop who knows how to work on conti cars. KL/ Selangor has such workshop.

It is ok sounding to me. Maybe sounds rough to you due to the car being heavy and strains the engine/gearbox. It is an excellent gearbox and "pulls" well in all 6 gears. Just make sure change gear oil at good workshop every 30K km and change with filter every 60K km. If want to save some money, 50K km and 100K km respectively is not an issue.

This gearbox is not my worry unless you drive a GTI with DSG gearbox. Furthermore, Polo is non turbo so not much worry for stressing engine too. Engine oil change yearly or 15K km but I do it every 10K km.