Does that make it a bad game though?
Okay, this is my cue to bow out of the discussion. If you define a game solely as gameplay, then our differences can never be reconciled. In my experiences, I have played and enjoyed some games because of the (immersive) experience, and that hasn't always been dependent on gameplay (still not defined!).
I want to play a game, and have fun. Gameplay is simply how you interact with the game. The non-interactive elements wouldn't be considered gameplay. I don't want to sit there and watch some poor dialog with hilariously bad cinematics for hours on end. I could pay 10 dollars to watch poor dialog and bad cinematics at my local theater. I play a game to challenge myself and test my skills. Some test my skill physically, while others mentally. A game like Metal Slug, Contra, or Bangai-O tests my reflexes while a game like Tetris, Fire Emblem, and ROTK tests my mental skills. I'm interacting with the game in more active fashion.
It's what you do in the game, that is gameplay. There is of course do and bad gameplay.
Let me go back to COD4 again to show my point. The gameplay is all about shooting everything in sight. That was fun for the first time. I was experiencing the thrill of combat. That was based on a first experience. It was a combination of shooting and chaos that adds to the immersion and gameplay.
Now comes the bad news, the game is scripted. The feeling of experiencing the chaos of combat rears it's ugly head. Their focus in immersing the player ended up killing the gameplay. Instead of interacting with a well designed level, great AI, and fast paced action, I stumbled,
literally, into victory. A section I was stuck at in the harder difficulty was suddenly won because I found the right place to walk into. Everything died and I looked around confused since I barely shot anyone this time. The more I play, the more I notice the infinite spawning of enemies that could kill you, or be vanquished by simply walking into the right place. I mean, there are certain areas that requires good old fashion skills, like the final part of the Chernobyl mission where you have to defend till help arrives, but those are rare. Ironically, it was the very same mission where the scripted gameplay became more evident.
Now, COD4 isn't even that bad of a game, but even though it had a lot of immersion, it was easily broken poorer elements. I can not overlook the uneven gameplay. Immersion worked the first time, but it won't work a second time, not when the gameplay flaws start showing up.