I give a nod to the Most Overrated Game thread for the inspiration of this thread. So here goes...
Like so many movie sequels, there are plenty of examples of arcade game sequels that just don't measure up to the original concept. So, as the thread title says, what is the worst arcade game sequel, and why? Feel free to mention Bronze Age games, if you'd like. I'll go first.
MS. PAC-MAN!! Just kidding, folks...
Had you going, didn't I ?!? Ok, my vote goes to Spy Hunter II. Although the concept of a dual upright driving game seemed cool at the time, it just doesn't touch the original game. Midway tried to enhance an already insane game, and SH II just didn't come close. To me, the gameplay just wasn't there. Epic. Fail!