There are still beginners online and ranked will match you with them. You'll meet smurfs from time to time, but that's unavoidable in any fighting game.
Still majority should be real noobs, so you most likely wont be matched with advanced players, unless you want to.
Offline modes are pretty worthless aside of practice mode.
Story mode is like 1 hour of gameplay maybe 2 if you're struggling.
Individual stories have the cheapest made endings in Tekken history.
No Team Battle.
No Time Attack.
No Survival.
Arcade Mode and Treasure Battle have abmysal Cpu AI.
They must've fired programmer that made cpu AI because it's not existent in T7. Ultra Hard in T7 is like Very Easy in every other Tekken. You can put on blindfold and mash buttons and you'll win every fight against cpu.
You'll never learn anything fighting T7 cpu, unlike say Tekken 5 DR where ghost AI was so good, you could learn like from a human and have satisfaction of fighting it.
Only difficulty is in Final Chapter in Story Mode because it's a boss fight, that doesn't matter since it works by it's own set of rules.