It was the best interceptor of its kind in 1945, by nature of its performance, and that is not disputed seriously by any student of WW2 history.
It had the same problems associated to all the LW combat a/c of 1945 (Bf 109, Fw 190, ect); problems with deliveries of spare parts, fuel, replacement pilots, and other infrastructure needed to sustain a modern air force in the field, that was not the fault of the Me 262 design. It arrived during the last year of the war in Europe.
As far as "causing a one percent loss on its best day" thats a silly claim, because it takes a small # of fighters and compares it to the overall side it intercepted, and tries to make it sound insignificant. Its a gross over generalisation. How many a/c did the Russians, RAF and USAAF have up that day? should we compare them to all that? its nonsensical.
You would not have wanted to be the bomber group who got intercepted by them, 262s caused a lot of consternation amongst bomber crews, and for good reason, the defensive weapons on bombers of the day were of little use against a fast moving jet fighter.
As far as being hard to land, I have never seen that written anywhere about it. Its engines did require a lot of maintenance, thats true.