I have SMG2 and have 92 stars so far.

She is on the spot, live talking about the game.  Maybe she didn't express her opinion in full?  Regardless, you can't say what game is cartoony and which one isn't.  You can't tell someone what they see.   She felt the game was too cartoony.  It's a logical opinion because the game is cartoony.  She felt it needed less cartoony-ness and more 3D.  Both logical complaints about the game.  Maybe she detests the art design in the game but loves the DS ones.  Who knows.  They are two different games and while you can tell the resemblance, they are from two different spectrums.

For some people expecting a full immersive 3d experience, 30 minutes is quite a deal breaker.  If Uncharted 2 switched up mid game to some 2D mini game people would be bitching up a storm about it.

How does disliking elements (that are present in a game) constitute as fabricating reasons to dislike a game?

She thinks the game is too cartoony.  She wanted something less cartoony out of Mario Galaxy.  She doesn't dislike cartoony games she just felt this one in particular was TOO cartoony. 

Haha, I find it funny how much you're defending her even though she's obviously being irrational.

Note: She didn't say she didn't like 2D, she just wanted more 3D. You're making something up to defend her "More 3D" statement.

Note: Mario games are cartoony and she should know this fact. She should not expect more mature content such as guns or the game sticking to the Brown and Gray palettes. She is irrational in this regard due to the fact that other Mario games which she like are cartoony and Nintendo would not change the art style.

Far from it.  I have no intent to troll.  I own every Nintendo console dating back to NES (Although a damn power surge fried my NES). (On a personal sense, I will say I've been disappointed by Gamecube / Wii ) but loved my N64. Regardless,  I'm actually not talking as much about Super Mario Galaxy 2 not being a good game.  I've never said a word about the differences between Galaxy vs Galaxy 2.  It's a sequel, if you liked Galaxy you should like Galaxy 2.   They should be very similar. 

My talking point,  was in vein of the entire 3D Mario series (Although IMHO it's not limited to the 3D Mario series, I have legitimate beefs with Smash Brothers for Wii as well.).   I don't believe Mario has to stop being about jumping, nor do I believe Gran Turismo has to be more than driving.  I do believe that Gran Turismo has made thousands upon thousands of little changes that have had an effect on the gameplay of the game.  And furthermore it's developers have really pushed the limits visually.   

I feel that the Mario series has really stagnated in this regard.  I mean, Mario should be about jumping, but do we really need the same triple jump, etc in a Mario released 14 years later?   I feel like it's time to move on from some gameplay elements that were 'awesome', 'never before seen', etc back in 1996 and start re-tooling the franchise for the future.

She didn't want "more 3D". She wanted "a more 3D look".

Well, that could have spared us a lot of needless debate.

Mario Sunshine was a radical departure. And Galaxy introduced huge concepts which change every level.

I seriously don't know what you want from Nintendo.

Likewise, I find it really funny that it truly bothers you that she doesn't really love Galaxy 2.  Her opinions aren't irrational as I have stated.  For them to be irrational,  she would need to make a statement like (This game has too much 2D!! *In a game that has no 2D). 

Regardless,  30 minutes of 2D is 30 more minutes of 3D she could have played...Correct? 

She never mentioned guns, or gore or Brown and Gray palettes.  She is not irrational in this regard because while other Mario games are cartoony, they have varying levels of cartoony as they are different games, on different systems,  with different art styles. 

Now, If she loved, really enjoyed, the original  Super Mario Galaxy ...(Which I have no idea) than she is a hypocrite for the reasons listed and is being irrational.  But only If the above holds true.  Otherwise, she is fine in her complaints. 

On a simplistic sense?  Something that is still true to Mario but is new.  I want a new Mario game,  not a Mario game that controls the same as the last 4..Over a 14 year time span.  I feel all Mario since 64 have been very comparable.

LIkewise, the GT series have been very comparable since the first game in 1997.

You just don't make any sense and your arguments are so empty they're a real pain to read.