The A-10 is an ugly but extremely effective airplane but it does not look impressive in a fly-by. It not a sexy fighter nor a big sleek, powerful long range bomber. It has one purpose, close air support, which the Air Force brass has despised for decades.
Some opponents of the Hog say that for CAS the F-16s, F-18s, B-1s, etc. can perform CAS almost as well as the A-10 because CAS is about the mission not the aircraft and those aircraft have a much higher survivability record.
But for me the A-10 has something those fancy flying bricks will never have, the pucker factor. Enemy troops shit their pants and run when they hear the BRRRRRPPPPP.