Exactly what makes you think that Merriman is better at pass-rushing?
What have you seen Merriman do that makes him so good? What has he done that Ware hasn't done?
I've seen 15 out of Merriman's 15.5 career sacks, and I don't think there's any way you can look at them and say he's a better pass-rusher than Ware. There's not one of them that was more impressive than anything Ware hasn't done a bunch of times, and most of them are MUCH less impressive than almost every one of Ware's sacks.
I've been asking Merriman boosters these questions for almost a year, and none of them have ever given me a decent answer. All they can say is that Merriman has more sacks. Well, that's nice, but it doesn't make him a better pass-rusher. When you get sacks because a quarterback trips over his center and lays on the ground or because the quarterback runs right into you when he's scrambling away from someone else or because nobody blocks you or because you trip the quarterback when he scrambles past you, it doesn't make you a good pass-rusher.