Actually if its your first car then definitely you'll fall in love with Altroz but if you have experience in owning other brand cars then you can easily feel the disadvantages of Altroz.
Disadvantages :
1) Engine performance
2) rear seat thigh support is not good for long drive.
3) Gear will be harder
4) car cannot climb hilly areas easily
5) rattling sound while driving
6) little bit vibration inside cabin
7) poor plastic parts
8) body roll during driving makes you uncomfortable
9) poor support from service centre
10) last but not least its 3 cylinder engine will make you regret for sure.
Advantages :
1) build quality / rigidity
2) awesome exterior design