We only support offline play on consoles unfortunately
Hard, sure. Insanely? Not really.
It is insanely hard for me and I have thousands of hours (albeit as a dev) in the game. For me it is insanely difficult but I wouldn't say I'm "great" at the game by any means. Cataclysm is way harder than legend though
We recently made a change that allow you to play weaves with bots aswell as a few tweaks. It's still hard as nails so if you're thinking of jumping in I would suggest being really deep into the main game before trying it out
Back to Ubersreik contains three missions (and a hidden one) and 5 new weapons. Winds of Magic contains the weave game mode with 40 separate smaller missions spread out over 160 different challenges (that you can play with bots) with a unique weapon customization system , one adventure mission, 5 new weapons, an insanely hard difficulty and a new enemy faction.
Whether a DLC is worth it to you or not I will leave to the community