From what I have heard so far - only one singer from Pakistan and one from Dubai are good... A couple of them in the Eklavya gharana are good too... and thats were it ends! I think in C05, even with the first couple of episodes we could identify some good voices...
The bold phrase above is the key - so far. So far you haven't heard them enough to come to a proper conclusion. You're talking only about Amanat and Wasi, but you can't judge the others simply based on one performance. According to reports, Musarrat has wowed Alka and the mentors with his performance in the coming week. Reserve your judgment until then.
Think of it this way. If you had to judge Amanat solely on the basis of his performance in the RD Burman round, you wouldn't be regarding him so highly. You like him because you saw how he performed Mitwa. Similarly, it takes just one performance for a singer to make a place in someone's heart. For any and all of these singers, that one performance may be just around the corner. Wait for it - a little bit of patience is required.
Otherwise there is no difference between you and Himesh - you're both dismissing the contestants even before giving them a chance to sing. 😉