Darktide for $20 is pretty good, the latest update fixed the biggest problem the game had, that being the awful RNG involved in getting weapons. The game does still run like the average 40k tabletop player, and it's a bit short on content, but I'd say it's pretty good otherwise. Necromunda Hired Gun for $11 is a steal. Vermintide 2 for $5.60 is a good deal, but you also have to buy like $20 of DLC to get a complete game. Gothic Armada 2 with all DLC for $11 is also great. Space Hulk Deathwing is a game that exists, and I like it quite a bit, but it's Streumon Eurojank, good deal for around $8. Mechanicus + DLC for $12 is a steal.
Dawn of War 1 and 2 not being on sale again, and going for $30 and $45, for games that are literally over 20 and 15 years respectively is fucking wild though. Also Dawn of War 3 isn't on sale because they don't want you to know how bad it is. $111 for Gladius' complete edition is a fucking joke. All of the Total WaWa games suck dick at varying levels, but 2, the one that sucks the least dick isn't even on sale. Space Marine 2 isn't on sale, but it's doing too well to get one anyways.
Didn't play any of the other games so can't comment. Kind of a schizo scattershot on the discounts and prices, not gonna lie.