Is it really excellent? I mean, the game still FPS drops, when only one person in a multiplayer match is lagging. But maybe that could be attributed to engine problems, rather than network code issues.

The rest of the code seems not too great either, considering the humongous system requirements, compared to the historical versions of the game. If you ask me, they could have kept it 2D sprites and it would have been completely fine. But they had to go 3D ...