Hitler, for all his faults, was no puppet leader. You must have heard that rumor from some crazy conspiracy theory website or something. Sure, some of the top ranking Nazi's close to him (Himmler and Goering for example) would often pull the wool over his eyes when it came to giving him bad news, or would try to influence his opinions when it came to their own personal power struggles within the party, but as for pulling his political strings ? Those that tried, met with little success.
Hitler was feared for his single-mindedness and ruthless, verging on irrational, determination. Indeed, refusing even the best intentioned advice was one of the major flaws that ultimately led to his downfall. Not even the rational-minded Albert Speer, one of the few trusted colleagues Hitler had left during the final days, was able to convince Hitler to surrender Germany when the Russians were virtually knocking on the bunker doors.