I think that's a fair assessment, a jack of most trades and a master of none. His best look might be the delayed blitz. Lots of mop up work in those tackling numbers. But I'm not sure how smart he actually is.
It seems to be he's often blocked out at the second level because he's flatfooted, not anticipating where the hole is going to be, waiting for the play to come to him, then slides off the block to make the tackle after the gain is made. On a bad day, this is the kind of stuff that get's him compared to the post-2010 A.J. Hawk.
In 2017, they took his play calling responsibilities away and gave them Clinton-Dix and then to Burnett when he moved into the hybrid ILB role. Martinez is in his 4th. year now, so maybe he's got the hang of it now? Then I saw Preston Smith making a line adjustment call on the first snap in the Eagles game, then some kind of hand signal to his helmet on the second snap followed by Martinez making a signal to the secondary. What's that all about?
Martinez is an every-down ILB for a couple of years running, a 4 year starter, and the longest-tenured defensive starter in Green Bay. I assume he's wearing the speaker helmet and making the calls in the huddle. And yet Za', the new guy, is the defensive captain for this season. What does that say?