The game was broken on launch date, till today there's some achievements don't track properly. Many of them are too much time consuming and very boring, repetitive, doesn't enrich the gaming experience.
Putting that aside, the campaing was only ok, the open world areas are a waste, trying to be a filler to an uninteresting campaing. It has some good firefights but overall aren't worthy. The difficulty on this game is based on how many want to screw/punish you on Campaign/horde/escape.
Graphics are good but the general performance at least on PC is irregular, random stuttering during matches 'cause probably it loads custom weapon skins when they're pick up, if the game is on HDD like on Xbox One, there's a high time response causing such stuttering, also when bosses spawns, is annoying. The first years was horrible with random crashes and most sometimes BSOD, alongside the GW502 error, the only game with worse performance was Gears of War 4, common denominator: TC poor programming.
Campaign DLC is very short, tasteless, you're about to get action too late. Too many sections where you only walk without sprint, you can't skip some of those dialogues ingame.
Escape mode is entertaining but abuses on pretty generic assets, if isn't on ice levels, are factory levels, too boring see the same maps accommodated in different ways. The majority of claases aren't suitables for many hives, forcing you use some specific classes, for those skilled players isn't a issue, but actually if you like for example some class and want to use it on hives with huge disavantage, it won't be enjoyable after all. Those who beat all hives with the "worst" classes doesn't represent the average player trying to have fun in a sense not everybody have the same skill.
Horde mode with daily modifiers present the same problem with only using certain classes to beat it more easily, despite that, is a disaster play a team based game with people that play the opposite, for example, an assault class that uses explosives, some players use it entirely as engineer, all because this bad game design is so open causing any player do whatever they want, not matter if they do it to the detriment of the team.
Versus is a total mess, I didn't mention that PVE had several changes, some positives, other were for worst, in versus was the worst, the gunplay doesn't feel enjoyable, all related with competitive like earn rewards, rankings, etc. feels more like a full time job than actually enjoying a game.
Maps designs only improved with the latest released, the rest are just generic artistically.
The service model on this game is predatory, exclusive expensive skins and the majority of them are incomplete due the scorcher was added after. If you don't buy them, you can earn coins in an insane grind. The Iron is useless, only if you want to get the skins asap 1 week before the rest can earn them through playing, and you can't use it to get those exclusive skins like Chrome Steel.
Talking about coins and iron, TC made something called boost, mainly to make more players addicted on focus only on level up asap, they made less events to make players buy this boost, otherwise it'll take a lot of time to level up, and there's some achievements for level up, so, basically pay for earn it.
Talking about grind, to level up classes and cards are ridiculous, some necessary cards are unlocked after a lot of hours playing, if you want to go on faster, you need to play on Master, but of course if you play it without cards you'll be punished horribly, so playing in lower difficulties doesn't help due the horrible reward system, giving you repeated cards you don't need. In the first years of this game it was worse.
Overall game only can be enjoyed with a close group of friends, but after all disasters there's no real incentive to play. TC made a bunch of players only focused on unlock stuffs, play for rewards instead of play for fun.
A personal note: versus is too garbage and their player base make this game more toxic. Very hypocritical TC not tolerate the toxicity at the same time they put offensive emotes or bloodsprays to foment it. And regarding achievements, I left some of them 'cause are too stupid like kill 100,000 on versus, attempts against mental an physical health specially for those true achievement hunters, causing only a kind of addiction on only get the achievements instead of play for fun, even if hypothetically versus was awesome (which isn't the case) is still nauseating.
In conclussion, is a irregular game, but with a very bad developer behind, poor costumer support, poor treatment to the user, random stuttering/crashes on high end PCs but being a minority, who cares? And finally the constant changes since the game was launched, different versus tuning, the change from heroes to classes, adding/removing stuffs in skill cards, etc. It just shows they have no f#@!cking idea on what to do. One of the worst studios I ever seen. I'll never confident on a project of any of their members, being Gears or non Gears games.
.5