I legitimately liked the game. It was refreshingly basic, which sounds strange. Too many games nowadays have thousands of guns and hundreds of enemy types to fight, and it gets bloated and annoying. It's the reason most people didn't like The Force Unleashed, it just added too much bullshit and wasn't the basic "killing stormtrooper fun". The Order trimmed all the bullshit away, giving you the few types of guns that you would only ever use in other shooters anyways and a few enemy types removing the unfun "crazy" enemies.
I thought the story was pretty enjoyable, too. They twist the Knights of the Round Table fable in a fun way, adding in a gothic enemy type that feels like a holy order would secretly fight. What I really liked about the story, besides setting and such, was that it didn't feel like it had to explain every single thing that had happened or would happen. Why does Igraine have a scar? It doesn't matter, so why would you waste time doing some hammy, cliche explanation of how she's "tougher because of it". What happens to the vampires next and where do they come from? I don't care where they come from, it's some fun world building that lets you know that the order isn't taking on every single problem in the world. Sure the whole package was pretty rote, but sometimes that isn't a bad thing. Sometimes you just want a dumb romance movie like Titanic.
People keep comparing The Order to Gears of War, which I don't think is entirely fair. They're both third person cover shooters, but Gears of War has much slower combat, fighting bullet-sponge enemies, and The Order is quick and snappy. Uncharted is a little bit closer, but the aim in that game felt floaty and imprecise. You can shoot super accurately in The Order, aim very quickly, and best of all kill people with one damn headshot. All in all, I had a great time with The Order, but I can absolutely understand why other people didn't.