But when Uke become very active, suddenly all delusions of grandeur go away and we are faced with painful reality -- our techniques always sucks.
This is more caused by trying to execute a specific technique where the situation is not really suited rather than 'sucky' technique on its own.
Do not forget Aikido technique is for training/learning purposes. When aite quickly changes intend and/or attack the situation becomes more and more similar to actual fight. You leave the training premisses and have to adopt. Think randori: you hardly/never see yokomen kote gaeshi, shiho nage. Why is that? ...it takes took long given the speed of the attacker. You cannot match your movement with that of aite.