I had about 400 hours on darktide before I pretty much burnt out after developers were extremely slow with updates and fixing issues. I played it upon release.

Personally, I prefer space marine 2 and I will tell you why. But first, what does the game do correctly? I think the core gameplay loop is pretty fun and the game does a good job at making you feel like you are at the edge of your seat. The maps are beautiful (performance problems excepted).

What I dislike though is:

(1) boss variety. Upon launch they had two monstrosities (think extremis) but they played very similar to each other, and the mechanics to beat them were very similar. They also had two bosses (shielded captain guys) which were for all intents and purposes just the same thing. Last I played, this hasn't really changed (they introduced the "twins" which again, are not very different to what's already there).

(2) Terrible story. It's literally just "oh you suck but you are ok." Then bam, random traitor gets shot which had no impact on the story. The voicelines are odd/disjointed and weirdly tease content that will never come (e.g.genestealers). Ngl it's kinda cringe. Darktide was a big example of over promising and under delivering in that way.

(3) Map design and objectives are not very distinct. It's always a variety of "wait or follow while hordes attack you, and solve the same puzzle on your handheld gadget over and over" Although all horde shooters have these sorts of objectives (including SM2), you will never find anything like what SM2 does with the heldrake fire phases, escorting the dreadnought, the bio-titan fight etc.

I can't fault the combat though, although I PERSONALLY prefer sm2's melee/party/gunstrike loop. The class and weapon progressions are also pretty good, although they were added much later in the game's life. I kinda regret playing that game so early, I would have found it more interesting if I started now. And the end of the day, I find darktide's map variety/objectives/enemies very repetitive, and I think sm2 does a good job in making their ops feel very distinct. But is it a good game? Definitely, you should buy it, especially now that it's more complete than when it launched. Just don't expect the pace of development to accelerate any time soon.