He did indeed build some beautiful buildings but there is far more to administration than that. He was inefficient because he was almost constantly putting down rebels 're-treading old ground' and any administration he did set up did not last long. His conquests were mainly driven by loot, he ruined trade and has been called 'the greatest bandit of all time'.
He claimed Mongol descent for authority's sake but the truth is he was nowhere near the ruler he tried to emulate

......Orda