Agarest: Generations of War 2 is definitely a game that I almost can't recommend. While I love the concept of having the storytelling take place through multiple generations of the protagonists, it also has some features that can potentially sour your experience.
This game has multiple endings and the true ending can only be obtained by a multitude of factors, so I heavily recommend using a guide. The factors involve seeing all of a couple of characters events (through out multiple generations), and keeping a high affinity through out your entire party (except certain characters). Seems simple sure, but these events can be scattered across the map and locked behind other prerequisite like finished commissions or affinity level. The game is also grindy and if I recall, affinity can be raised by fighting multiple battles. If you don't wanna do that shell out a few bucks for the dlc that helps with leveling and affinity to help events appear before certain points of the game.
Shouldn't be an issue if you have a guide, but if you look past that you have a unique game, with straightforward yet compelling storytelling, plenty of unique characters and an earnest protagonist that doesn't wussy foot around and get straight to business, although I can't say too much for the later generations overall attitude plot wise. The gameplay is a lot of things, it can be quick, flashy, spammy, kind of repetitive since you gotta grind, and takes some prep work to bring out the most potential from your characters. But it is very rewarding once you see your hard work in action, or you can just buy the leveling dlc to blow your opponents to oblivion if you don't have hours on your end to grind. (again consider the possibility of being locked out of certain events due to affinity levels being tied to them and battling as a way to raise it) Lets see...oh yeah I don't care for the fanservice in this game, I would much rather have more events that flesh out the characters a bit more than fanservice. But yeah, this is a really unique JRPG and if none of the cons bother you I say go for it, It was definitely one of a kind when I finally beat it. And I'm somewhat doubtful we'll get any new JRPGS with a concept of generational protagonist anytime soon.