You are not wrong in general, re trolls and the Turtle Cannon esque troops, particularly in the hands of the AI. Rover is poor in that it can’t be at the top of the order, it’s colours don’t synergise so well with optimum stuff at the same time. Conversely however, Turtle Cannon in the hands of a player and using a Doomed Weapon can be effective , if (and that’s the caveat - if) you use it wisely.
Turtle has stoneskin, so it can withstand none enraged blows okay. This tends to allow you to go extreme with green. I can’t remember the exact team, (will dig it out) but I did use something with T/C and Doomed Club pretty okay levelling Frostmage or possibly Warden I think.
(After looking deep into discord and Line ) - I think the team was Wrath, T/C, Doomed Club and Forest Guardian. I think now it would probably work similarly with Glaive. I know I used it on brown GW to nice effect, (with Yasmine instead of FG iirc) but it was hopeless on defence. On offence, you pick the gems around doomskulls and ofc other skulls and with Wrath exploding skulls and so on, it generated and filled easily. This can give it a little advantage over Forest Troll at certain times when player controlled.
Could work with Corsair blue, keeping Fg for 50% start I suppose, or Tidecaller which has the fast and the blue explosions.