"cod5 with cod4's engine - intensity of cod4 "
Uhm, what? How do you figure that? The engine is just rendering stuff and keeping assets and AI floating, the contents that made CoD4 intense was the scripting and game design. Treyarch haven't got the talent and experience that Infinite Ward have which is why CoD5 is less interesting.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!
"The sky was the color of a TV tuned to a dead station" - Neuromancer
