3D has always been hit or miss, and we are way past the days when they're still something completely mindblowing. 2D always managed to look timeless...but Pokemon X/Y right now looks dated already. I get what they're trying to get with the artstyle, but it's not fit for 3D at all.
This! I feel like the 3Ds can really push it. I could understand though, not making the quality too high because that means TONS of work for the animators! I see how this could've affected them trying to find a middle ground between 3D and 2D. Think Crystal for gbc I guess!