I will not go into the voting thing. But will explain a logical thing.
It depends on where are you upgrading from. If from a Mehran or Cultus, no the 1.3 A/T won't feel underpowered.
If from a City manual, Gli manual or higher variants then yes it is underpowered.
I upgraded from a Santro to 1.8 CVT Altis aur shuru me it gave me chills when i floored it. Ab kabhi kabhi mjhe ye bhi underpowered lagti he because I am used to it.
GLi just gets the things done. AC, normal routine driving, highway driving. It just gets the things done. But there is no excitement in driving it.
1.6/1.8 brings the excitements factor into play. You can trust your car for quick overtakings which is not the case for Gli auto. Fun factor makes the 1.6/1.8 a pleasure to drive. Also the price factor, 1.6 isn't that expensive from gli auto and it gives more goodies. So with these things in mind, 1.6 becomes a better bet.
Overall, no the GLi is not underpowered for daily routine driving. It's just not fun. When you spend 2 million on a vehicle, you should get a bit of fun factor too. Just my 0.02$