Its a nice car, and probably the only new-ish sedan in your range.
Another option is spectra, but maintaining one (especially with the rare availability of parts) is a nightmare.
Margalla however is a Suzuki, so parts are cheap and there's ample availability of mechanics.
The resale is good.
The body/build quality is better than the newer suzukis (as with the case with everything else in Pakistan - old is gold literally fits us Pakistanis).
Performance : its not a performance oriented car : its a family sedan and is a pretty decent amongst the available ones. Don't expect awesome 0-100 timings.