I also have mixed feelings about DQ 11, but possibly for different reasons.
I thought it started out great, and it had so many great moments along the way. The game has an incredible amount of polish. I actually do like the battle system for the most part. It wasn't ZOMG amazing, but overall I liked the battle system. Lots of the characters I encountered along the way were charming and interesting.
My main beef is that the primary storyline is just way too long. At a certain point I just found the game to be tedious. It was weird too, because I might be enjoying a certain moment a lot and I still found the game tedious. It's well polished, but it's just waaay too long. I want my main storyline to be shorter.
Ironically, one thing I really like about a RPG game is a lot of optional and post game or end game content. I can tell DQ 11 had a lot of this, but I didn't bother. Once I completed the storyline I was done. I no longer wanted to spend any more time in that game world. The long storyline ruined all of the optional content that I would normally love in a game.
Older DQ games were shorter. That is what I want. Ironically it doesn't need to change more. It needs to get back to it's roots more. Modern turn-based RPGs in general are just waaaay too long.