That sounds like a good idea. At first, I thought that enemies with 50%-70% were supposed to be the norm for enemies, as they would have to be effective if they were soldiers of an enemy organization; but, I can see that having far less skilled enemies would keep PCs alive much longer, and at the vary least, make it look cinematic, even if they missed all the time.
How would you handle larger encounters though? If any enemy can kill you so quickly, the best thing would be to try and engage fewer enemies at once.