For Xillia 2, I agree with many of the complaints but I still managed to have a lot of fun playing the game.
The "need to grind money to advance the game" argument is made over and over when all you have to do is fight ONE of those bounty monsters and you get enough gald to pay off the debt and advance the plot. But still, it's a pretty horrible mechanic and a dumb way to gate progression.
Also, the game has many bosses that are utterly sadistic. In many areas I can kill the wandering enemies in 5 - 15 seconds, but the boss still wipes out my party in no time, forcing me to grind for another 5 - 7 levels
Tales bosses have really bad mechanics anyways but Xillia 2 bosses at least have an opportunity to unload combos on. You need to start a weakness combo and keep it going as long as you can, and the boss won't be able to interrupt you. And for Chronos, once he starts to use the ability that resets the fight, you need to cancel it by having Ludger Transform.
(when the EXP rewards are non-extant and don't even match what the game says it is! Seriously, compare the EXP displayed to how much your EXP actually advances sometime)
This was introduced with Xillia 1 and carries over to Xillia 2: depreciating EXP from enemies. I HATE games that do this but Xillia / 2 does this even worse by not even updating the new EXP value. So if you're too high a level for the enemies in an area, their EXP starts to scale down but the end of battle EXP display is not updated to reflect this. Caused me a lot of confusion early on until I realized they went the frustrating route of having EXP scaling.
As for disregarding the series as a whole: while Symphonia is often praised, if you are used to the free roam mechanics in recent Tales game, it's going to feel extremely primitive (you're stuck on a 2D plane without the ability to freely run around on the battle map).
I quite liked Abyss and Vesperia, but I'm really not sure I'd recommend them to someone who didn't enjoy Graces, or Xillia 1/2. They're not THAT different (battle system changes very little from Abyss onwards).
My biggest praise for Tales games are the characters and their stat progression systems. While the stories are often very subpar, the character's interact with each other in hilarious ways that I really like. The writers seem to excel at character interaction while being very lackluster in creating an actual story.
I get addicted to recent Tales games because of their very satisfying progression systems: namely Graces'. I LOVED collecting and mastering the Titles and there were SO many of them. I was still learning new artes for Asbel at the 90 hour mark after completing the main story (because I for some reason hadn't unlocked certain titles that taught those artes), and it felt really cool to still be learning new abilities that late in the game.