I keep starting this, playing some then stopping lol, is it worth getting liberty city an starting from beginning? Or is liberty city something all on its own?
The Liberty expansion just unlocks another part of the existing map from the base game that was blocked off prior. You can start it whenever you like. It turns up in your mission list as a side quest to meet a certain character at a certain location near the level entrance. I nearly started it early doors by accident till I realised it was part of the expansion and not a base game quest. You can travel between base game and expansion anytime between missions just by using the entrance between maps.
It also apparently gives you another ending to the original base game. I want to try this as I reckon I messed up my game ending as someone distracted me at a key point and I lost the thread at the finale.
Everything in the game levels up with you so it's always balanced. Theres also a new skill tree called "the relic" or something which gives you various character boosts esp in melee which is of no interest to me personally.
It's generous with various fairly high powered unique weaponry you can loot/find.
New vehicles not so certain tbh. I just bought the best bike available and stuck with that. It's far nippier in heavy traffic.
It's worth checking out and you can dip in and out of it. I just find it kind of underwhelming after reading various 10/10 "perfect" reviews of it. It's not.
I'm in no hurry to finish it and keep putting it off.