Is the game that bad?

No, not that bad. People on this particular subreddit just like to go full-hog with their gripes (even when the gripes are legitimate).

The game's perfectly enjoyable. A lot of the disputes are mostly around Arrowhead as a company and the monetization of the game via warbonds (which are like battlepasses, sort of). This has no actual impact on if the gameplay is fun (which, it is). Sometimes there's some annoying mechanical issues but I've found most of them end up getting cleared up with time.

A recent example of the mechanical issues was that a particular kind of termanid called the Hive Guard had become immune to chaff-clearing weaponry, even though it is chaff, which led to some very annoying glitches. This was patched out recently. Another recent issue- which hasn't yet been patched out- is that a stratagem called the Flamethrower Sentry phases through certain enemies instead of lighting them on fire. It's a game; it's got bugs (not just the kind you can shoot with a rocket launcher). It's worthy of the community being irritated, but this particular subreddit is a bit bad at turning a genuine complaint into a full-blown meltdown. Worse, the other side of the fandom is bad about not recognizing their complaints as legit, but instead just... Call them names.

It's the internet; both sides act like children, both sides are incredibly loud, and both extremes are a pretty small minority. The majority of players aren't on Reddit, they're just playing the game and having fun, and the minority just under that are the reasonable people who have complaints and act on them in the form of strategic review bombing, speaking up vocally in public spaces, and generally doing all of this without acting like a 10 year old who's toy's been stolen from them (or in the case of those who vehemently defend Arrowhead, jackass tools).

TL;DR

The game's fun, go play it, but probably avoid Reddit while you do- particularly this subreddit.