I aggre, however some of the best looking 3D games are alot better than the best looking 2D games in my opinion. Graphically 3D games are better, but mehanics are alot easier to implement and execute in 2D games.
I wouldn't state that 3D games are graphically better... Some 3D games are actually a graphic nightmare, and then I limit myself to the graphics alone. Take Final Fantasy VII, and then I mean the not-in-combat models... They look terrible even for its time. The in-combat-models however are already a lot better. I know I now triggered a nerve at many fans for bashing down FF7, but I must be frank here. And there are also a lot of 2D games out there that are graphic jewels in a way that 3D could never reach... Of course, the choice is also dependent on the type of game.
I did once play a demo in which the creator tried to make a setup for a point and click adventure (for which 2D is nearly always better, tbh) in which they tried to make the entire world look like painting by the Dutch artist Vincent van Gogh. If that is the style you opt for, I think 2D is by far the better choice unless you are a real expert of the highest level when it comes to 3D. However when I take a look at "Alice: Madness Returns", that game has a kind of getup that works only because the game is 3D, not only because of the game's mechanics (A 3D platformer with slight adventure aspects), but also due to the kind of mood they tried to create and the way they tried to combine realism with surrealism worked out so well due to the 3D graphics.
It always comes down to the type of game you create.