TBH, I got really sucked into this game when I tried it for the second time but I know why
It's the thrill of fighting huge robot dinosaurs, upgrading gear/picking loadouts and the decent bow combat paired with the graphics, not some outstanding systems or multilayered story and characters. The game itself had quite a few flaws, the on-rails climbing was terrible, the chars were mostly rather flat and the story, while solid, was fairly predictable so you could see where it was going after a couple of hours.
Regarding combat, I felt it was actually too easy even on hard TBH, you didn't really need a lot of strategy after a while and the machines were easy to dodge.
I'd still rate it around 8/10, was pretty addictive for me, very good graphics, enjoyable combat and still an above average storyline overall. Also loved the running animations.
In comparison, the sequel is significantly worse and skews the balance of the first game in favour of more pointless upgrades, lots open world clutter and a story that's ploddy and rather uneventful even after 20-30h after which I took a break from the game. Found it hard to care.
It looks fantastic and improves on some of ZD's shortcomings when it comes to movement (paraglider, a bit better climbing etc.) but that's about it. Also, it's significantly harder (for bad reasons) so if someone had a hard time on lower difficulties in ZD, they're in for a fun ride