It's probably the most popular RTW mod (although not strangely not discussed much by Org members despite the endless grognard grumbling about vanilla RTW).
It started off getting rid of the "fantasy" units of RTW and gradually replaced virtually all the vanilla models with more authentic (and arguably better looking) ones.
It also slowed the movement speed and kill rates, and raised morale, so that the battles "feel" more like those in MTW.
It rebalanced the combat arms. Cavalry & missiles were somewhat downgraded in power (& cavalry raised in price), making heavy infantry more dominant than in vanilla. Peltasts and javelins in general arguably have more of a role in RTR than RTW.
It implemented a nice recruitment system whereby it takes years to train units in captured settlements. This acts as a break on player expansion.
There are also some changes to the strategic map: more provinces, more realistic starting dates and changes to the faction line ups (unified Rome, no British faction).
Naval combat was tweaked to be more decisive.
The main version is RTR Gold but it has recently been ported to 1.5 (RTR Platinum) so players don't have to put up with the save/reload bug, bugged charge stats and can control bandit/pirate spawn rates.
If you want to see what it is like, have a look at the "Will of the Senate" PBM in the Throne Room, e.g. the battle reports thread:
https://forums.totalwar.org/vb/showthread.php?t=65721
To be honest, I got very disillusioned with vanilla RTW - no challenge, didn't feel very realistic. But after finding RTR, I've become a fan of the engine.
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