Most every issue has been fixed, resolved, or altered through the various patches and has shaped up to become a very good Total War. Pathfinding and diplomacy were both ironed out and I dare say the best in the franchise now. There may be issues one doesn't like due to the subtle differences between Rome 2 and other Total War games, but that is going to be down to personal preference, not technical or design faults.
I say it's well worth it if you were a fan of any past Total War game (excluding Shogun for it's visual style and Viking: Battle for Asgard for... what it was) and more than enough competent game to satisfy most every strategy fan. Large scale battles, boats, differences between cultures being more pronounced, terrain mattering, all very good fun.
That's great to hear. I'll definitely be picking it up.