Am now several stages into Chapter 5 and
still don't have everyone unlocked yet.

Did finally get my girl Koshoushou at least.

Was thinking that Athena would be playable once she joined the good guys' side, but nope...just like Perseus, she's staying an NPC for now. Am told that I should be close to getting one of them playable soon at least.
Chapter 5 has also been ramping up the amount of stage unlocks. Got two new stages after finishing one, plus another two side stories. Why they didn't space things out more in the previous chapters is beyond me.
My thoughts on the game overall haven't changed much:
+ The game play is just awesome. Magic gives you more moves and it's a welcome addition!
+ So many characters to play as! Just about everyone has a fun move set.
+ Tons of weapons and weapon enhancements are available.
+ They make it pretty easy to level characters up between stages. With enough built-up experience points, you can take a newly-unlocked character and get him/her up like 15-20+ levels and give them some nice weapon enhancements.
+ Characters can be further upgraded to get additional abilities like air musous.
+ The new "monster" type enemies are welcome and some of them are huge, but more variety would have been nice.
- Stage recycling is insane. They don't just re-use levels from other Warriors games, but you'll end up playing on the same maps multiple times.
- I've seen one actual new level so far that had an ancient-Greece theme to it.
- For a game that has Greek and Norse gods as the big-bads, you'd think that there would at least be more of those themes in the levels, but instead you get the same Chinese/Japanese-style levels and Koei just threw in some visible Greek-style buildings off in the distance.

- Magic-based enemies are annoying. For example, there's a "chaos" enemy officer type who doesn't attack, but if in the area, will summon magic grunt soldiers and/or add magic protection to regular enemies and officers so that regular attacks won't hurt them. Magic kills these guys quick so most of the time they're just a minor useless annoyance as you wait to fill up meter to take them out. Maybe they're more of a threat on higher difficulty levels.
- You have to buy DLC to get additional game modes and even extra magic abilities for characters. This is the kind of thing that should have been free.