How much you'll like rondo of swords depends on how much you like the combat system.
Rather than, like FFT, Fire Emblem, Disgaea or Tactics Ogre, where you walk up to an enemy 1-2 spaces away, you hit them and they either wait for their turn to hit back or counter, RoS is a bit more unique.
When attacking enemy troops, you draw a line from your troop, through friends and foes, finishing on an empty space. Usually friends will give you buffs or heals, and the enemy get hurt (less for each one you hit). They might have defensive abilities, like stopping you after the first hit etc. Your own troops have defensive abilities too, like a foot knight stopping troops moving past him, or a swordsman counter-attacking.
It gets quite tough later on, and has a couple of different endings, but I found it really rewarding- it's unique and confusing at first, but then you get your head around it and start destroying the enemy.
It has a nice 'halfway house' approach to character death- if you lose a unit, they will have reduced stats for the next mission, encouraging you to use somebody else, but you can still muddle through with them if you like, they are just more likely to get KO'd again so you need to be careful.
Like many SRPGs, it suffers from some units being much better choices than others. art and music aren't great either, and the story of heroic nobles on the run from an invading army is nothing fire emblem and FF haven't done a dozen times over either.
What makes it for me is the maps. Outdoor battles are bloody and violent due to the huge amount of space leaving plenty of room for multiple attacks with each move on both sides, and will leave you counting squares to make sure enemy troops can't penetrate your formation (if they can't finish on an empty square they can't attack). Indoor battles are much more tactical- fewer potential moves, choke points etc.
All in all, don't expect to be amazed by the aesthetics, and I wouldn't recommend it to somebody new to SRPGs- it's hard and almost requires a bit of understanding of the genre. However, if you find yourself flying through FE etc and want a combat system brave enough to try something new with supporting units, where heroes can cut down multiple enemy troops if you deploy and play well, then it's worth investigating.