I would go with a tentative yes. I have only played the campaign for both games so heres my take:
KZ2 - This game was alright but not that great. Graphics were good but very samey - dark tones and buldings mostly. The story was alright but again not great and it had fairly cliched characters. One of the most annoying gripes I had was that the game spawned infinite enemies and to progress you had to push thru them in lulls and the firefights were repetitious and samey (blowing up so and so or taking so and so bunker). However, the ending was pretty good and some of the firefights a lot of fun.
KZ3 - Story was quite better than KZ2 and pretty much everything else about the campaign was much better too. There were a whole bunch of different locations and scenery in the game (which looked bloody awesome), There was a lot of variety in gameplay as you wear mech suits as well as use tanks/vehicles. Also there were no infinite enemies. I liked this a lot.
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