On orcs? Absolutely. Your team revolves around you not being outnumbered and overpowering your opponent. The more AV 8 (and goblins, for that matter) that you have on the field, the more likely you are to be outnumbered. It's simple math. People don't blitz your black orcs. People don't blitz your troll. In fact, if they can help it, they don't even stand toe to toe with them at any point. They hit the squishiest part of your roster, every single time, until they break it. Then they move on to the next one.Two AV8 is too much?
I had a lineman get a serious concussion early this season. The very next game he played, he was KO'd on turn 1 and spent the rest of the game on the sidelines. I fired him immediately after the game. That's not the kind of player you need on orcs. Yeah, on elves, you're just looking for warm bodies to get in the way, but that's not the game plan with orcs. I spend half of every game with no AV 8 on the field, and half of every game with 1 AV 8 on the field. I don't even want more on my roster so that an unlucky hit forces me to field them both.
You're certainly welcome to play the team the way you prefer, but I find the troll to be far too unreliable to be of use when the rest of your team has no skills. I've played against many orc teams with trolls (and I don't use a troll in MM usually), and the game usually gets decided by one Really Stupid at the wrong time that changes the entire dynamic. When you've got skilled Black Orcs and Blitzers, you can minimize and mitigate the negatraits on the troll. Without them, you're just rolling far too many dice and praying for luck.