Oh yes, I'm very expected about Space Marine 2, especially when I found out it's co-op for up to 3 players! The problem is, GW has a problem with having shitty games get made, Martyr wasn't very good, Darktide was received very poorly, buggy, unoptimized. Deathwing, same thing, buggy, glitchy, shallow.

Yes pretty much any other genre of game would be great, The RTS games in the Dawn of War series were great, 1 and 2 were fantastic, 3 was hot trash. First Person Shooters would be nice, 3rd person action games, god even a Telltale Games style story driven narrative game in the setting of you being an Inquisitor chasing a heretic would be wonderful. There are just so many things they could do with the setting! For me the sweet spot is audio books, I love listening to stories sets in the WH40k universe! The Eisenhorn series was fantastic! I also love a ton of various space marine centric stories. But I adore the Necron and had a massive amount of fun with The Infinite and The Divine (Warhammer 40,000), and The Twice Dead King series.