Yeah, my dad read the books so I knew about the yuzan vong (or whatever they're called), but Force Cthullu was a surprise. Really seems like a lot of garbage with a few gems, but I guess that describes Star Wars in general, especially after the reboot.
I was honestly perplexed at the inclusion of Old Ones in Star Wars. Though I suppose that if SMC is a prequel to Blade 2, then it exists in the Marvel Universe, which means it also can touch Star Wars because that is owned by Disney. Which means SMC is part of the Star Wars EU!