I mean, I know it matters to some, I enjoy SP too but with what's in Tekken 7, I don't feel disappointed with it at all. It has an Arcade Mode and a story mode, even if it's not as good as Injustice 2's Story Mode, it still seems to be better than SF5's Story Mode and it has a decent amount of customisation options to unlock and keep people busy with.
But MP is really where it's at for fighting games, as that has the most replay value and competing to be the best against friends locally or against randoms over the net is great fun and addictive.
Give it time to see how reactions and hindsight play out beyond first impressions of a single night of play. My experience after the first two hours of offline play...
-Arcade mode suffers from a lack of goofball endings making the mode feel extremely anemic and a bit pointless. One and done for me.
-Treasure battle makes for a conceptually fulfilling amalgamation of survival and ghost battle with occasional twists. However I keep running into the same AI opponents, sometimes literally back-back, which is making me question just how many unique ghosts are formally on tap to keep the variety in check?
-Gear rewards and customization feels lackluster. Too many global items making diversity feel rigid in customization, but there is hope with the free dlc roadmap to greatly improve this. It is still a nice incentive for solo play and some may prefer a more homogenous loadout.
-Story mode is great so far as a longtime fan that just enjoys seeing these warring Mishima's continue to do stupid stuff to each other. Though not much replay incentive exists and the character episodes are very lacking.
Whatever is announced for both the free and premium DLC roadmaps will greatly impact many perceptions beyond the honeymoon period. Right now it's ok, but not great to me.
Oh and MP is having severe connection and sync issues on ps4. Day 1 though, so hopefully it shakes out.