-The story is pretty short, maybe 3-5 hours. It's hard to remember as I played this game in a lot of small chunks.
-Look up a Let's Play of this game. You see that bard, Allegro? Do you like him or not? Because I swear he was at least half the dialogue in the game. I liked him for the most part, and at least tolerated him later on. If he really grates on you, that could be an issue.
-Plot is bland.
-Locations and levels are generic, don't stand out visually (another forest level, YES!). Also, a low variety of locales.
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Most of the AI is incredibly stupid and slow. Only a few enemies, and most of the bosses, are an actual threat (usually because they catch you off guard, because you haven't had to try for the previous 30 minutes of play). Many enemies will simply walk up to you and stare at you. Maybe they'll attack you if you take a nap. However some enemies are pretty fun to fight; the Ents can actually get hits in and do some decent damage, and they have some tricky abilities and longer reach than you'd expect. If every AI were closer to the Ents', this game would be much better.
-It can be embarrassing playing this game in public where you're sitting close to other people. Mainly due to the all-too-youthful protagonist's attire. This of course depends on you individually

-You can win by mashing one button if you so desire.
-Mediocre framerate (especially with 3D on; in fact, I highly recommend not using 3D because of the exacerbated framerate issues it causes). Sometimes it gets bad enough to hamper my ability. Sometimes it feels like 10 FPS. And a majority of the time feels 15-20 FPS. It's pretty sad. The lenient timings for connecting moves and the fact most enemies never block means the bad framerate usually doesn't hurt your performance. It did make some laggy boss fights a bit of a pain, though.
-The protagonist is incredibly boring, aside from setting up jokes about her outfit.
-The bonus missions are just repurposed story levels. Here's that forest, again, but this time there's more trolls in it!
-The item shop sells crap 90% of the time.