The complaint I’ve seen though is that the loot boxes don’t really become a factor until the end of the game, and that’s the point when they become near-necessary. The final push requires high-level legendary orcs, so the game suddenly turns into a binary choice: either spend hours grinding for high-level legendary orcs, or buy some. (Or, I guess, don’t finish the game). It’s the gating of the ending that I’ve seen most critics objecting to.
That said, I don’t know how true it is. Some critics have said that gate at the game’s end isn’t as bad as others make out.