We've been with Qatar Air to BKK via Doha 4 times. It's OK, but not splendid; some of the passengers to Doha can be a little rude, particularly to women. Doha Airport is dreadful - very small, with only 20% of required seats; the small restaurant is very poor; and the Gate numbers (both on the ground and first floors) cannot be trusted - we're often told to go upstairs, then we find that the flight is leaving from downstairs, and rush down!!
However, as we've been 4 times, it is acceptable!