Ok well Im going to post what I know on the subject. It just so happens that Im studying Hitler and Nazi Germay in college right now.
When I answer a source or an essay question such as this, I think it's alright to not come to a complete conclusion and say that he had elements of both weak and strong.
But after saying that in my opinion, the weak outweighs the strong. Hitler created mass confusion in government because of his lazy attitude towards work. He also distanced himself from politics which on one hand meant that he created a messianic position for himself, (the majority of the German people liked Hitler but disliked the Nazi Party). But on the other hand this meant that the 'mini-Fuhrers' such as Goering and Himmler could climb up the ranks, acquiring more political power for themselves. To look into this more indepthly, Hitler's lazy and care-free attitude meant that he was happy as long as everyone was working towards his will. So Goering and Himmler could acquire these positions as long as they could prove that it was what Hitler wanted.
You could also argue that Hitler's weakness also links in with cummulative radicalisation because all the afore mentioned^^ meant that Hitler wasn't present at all important Nazi meetings and a Nazi party member could get away with practically anything as long as they could prove that it was what Hitler would want. A good example of cummulative radicalisation is the death camps. The decision to build death camps was made without Hitler, by SA and mostly SS members. I believe that this shows weakness because Hitler created confusion in government, allowed Nazi members to gain more power, and it just wasn't possible for him to keep an eye on everything that was happening around him.
btw that was all my own knowledge.