As far as rasengan being cheapened i agree with Thorofasgard13 but only to an extent. the overall reaction to the jutsu has become lessened (cheapened). and the fact that it was the technique of the 4th just made it that much more special but then naruto created his own variant of it which made it that much more special. but the fact that it's being used by everyone (i realize that not everyone uses it but more and more characters know it) in a copied sort of way is what's lessening the over all Awe of the technique. and the fact that Konohamaru has to use kagebunshin to create and original rasengan but attacks with it like Oodama Rasengan takes away from the Jutsu's appearance in strength.