Hi Saskid,
>I meen just because it was very fast doesn't meen it is great.
It was fast in level flight, it was fast in a dive, it could go high, and it could range far.
Its direct contenders were the P-47 and the P-38.
The limiting Mach numbers, important for the dive speed, were something like Mach 0.75 for the P-47, 0.72 for the P-38, and around 0.80 for the P-51. Major advantage for the P-51 over the P-38 - it only tells up high, but up high is where the fight took place back then.
Then there is range. When the P-51 was introduced, it had a major range advantage over the P-47, making it the escort fighter of choice for the 8th Air Force. It could be the P-47 caught up later, but by that time, the 8th Air Force was (almost) an all-Mustang air force.
The P-51's opponents were the Me 109 and the Fw 190.
The P-51B/C was introduced into combat service in the European Theatre of Operation in December 1943. At that time, it held a major speed advantage over the then-current Me 109s and Fw 190s, and since the P-51 had a two-stage supercharger where the German aircraft had only a single-stage one, they didn't quite catch up with regard to high altitude speed even when improved versions came out. The P-51 always remained superior in that aspect.
>Could someone show me some statistics or accounts of why people think it is so great?
The Mustang was the fighter that defeated the Luftwaffe. At least, that was the opinion of the Luftwaffe.
With regard to statistics, a forum search will bring up a monthly deployment overview showing that the P-51 was the dominant fighter in the 8th Air Force from early 1944 on.
Regards,
Henning (HoHun)