Builder delivery timelines are mostly fiction, right?

Okay I'll be honest — I completely underestimated how confusing this process is. I'm based in Dubai, eyeing a 3BHK on Golf Course Extension, maybe M3M or Emaar. Site visits impossible. What's their actual on-time delivery track record like? Aur construction quality ka kya haal hai in projects like M3M Golfestate ya Emaar Palm Hills? Heard finishing issues are common. Need real ground info.