I've recently downloaded the game and played it for a few days...
I had good fun with Tekken Revolution and - even if I could clearly see the huge paywall behind it - I could still enjoy the game to 100% completion and manage to unlock a few cool extra characters (not that I really cared, since my main has always been good old Kazuya). The 5 free coins are still enough for me now, when I feel the itch to play it online that one more time.
That said, I don't really understand Lost Swords... For a single player only affair - even considering the ftp formula - it seriously feels too bland and unrewarding. I keep receiving useless and ugly pieces of 'armour' for Mitsurugi (stuff that it seems to look intentionally stupid on my character), as well as the very same variation of the weapon I already own; on top of that, I only managed to unlock Sophitia, and all the extra characters/outfits that are tied to those cool timed challenges feel completely out of my character's reach... Just too hard.
I'm at the point where I'm wondering: am I missing something? Did I completely fuck up my approach with the game? Or is it really built in a way that requires the players to spend money - a lot of money too, looking at that Mina banner - in the first place, in order to even try and enjoy the game?