I got into CoD late with my first CoD game being CoD: World at war. The WWII game. It was fun and I really enjoyed it. MP40's were OP as hell but it was fun. Then MW2 came around and I had a blast with that as well. Played countless hours with friends and it was really enjoyable.
Then when black ops came out I didn't see anything new that made me want to get it. Then MW3 came out and I still didn't see a change. I only have MW3 because one of my friends bought it after hearing I refused to buy it. I've played it maybe 20 hours, maybe? And most of that is because the same friend that bought it bugs me to play sometimes.
So for the most part, I haven't enjoyed CoD lately and I see where people are coming from when they accuse CoD of copy and pasting especially when they make a new game every year it seems. And each game has half a dozen DLC's before the next game comes out. Annoying.