this is pretty funny because if you look at the game in its core cod was more creative. im just talking about the parentheses here. did doom have 10 multiplayer modes, all sorts of ranks and stuff? no, it didn't, maybe it had levels, but it didn't. it was a shooter.
so what? that isn't the core gameplay, that's a bunch of stuff the developers did to make up for how unbearably simple the core gameplay is. ranks and stuff is just something to give the people who jack off to achievements a way to see how much time they've played the game. the 10 multiplayer modes are irrelevent (unless you want to go there, domination is broken, kill confirmed is broken, search and destroy is probably the only decent one that people play and that isn't tdm).
if you're talking about creativity, then call of duty certainly wasn't the first one to introduce ranks or 10 multiplayer modes.
again, gaming has regressed more than most people think because doom (in my opinion atleast) wasn't the best old first person shooter. marathon had non-linear levels with multiple endings, the first first person shooter to have dual wielded weapons, reloading, and probably one of the top 5 stories in video games.