I liked where they were going with the new movement options they added last game, but the rest of it still seemed too stale to actually draw my attention. I think Titanfall offers a similar but superior experience.
The player base has risen more and more after every new release, but I agree that the appeal has declined tremendously since the Modern Warfare series. Call of Duty is just becoming another space shooter at this point. Not to say it wasn’t fun this past weekend while it was free, but the series is losing its originality.