Yep, I agree it's not a patch on the Dead Space remake (or the original, to be honest) though visually it's excellent, the environments are incredibly detailed. I dropped the difficulty down a notch which made the melee-focused combat far less frustrating, though I gather since I played it at release they've made further adjustments to that, which is positive as it was punishing at times. Once you've unlocked more projectile weapons and upgrades it becomes less of an issue.
I think the main think it lacked compared to Dead Space was spookiness and atmosphere, it didn't really try to mess with you psychologically like DS does. The DLC was a big improvement in that respect, and if you enjoy the main game it's worth picking up the DLC when it's on offer.