I feel like it is. It has so many references, is really fun, and has nice interactions with all it's characters.

examples?

I don't know how to screenshot on a 3DS.

Maybe you can type some after you play again and notice something worth mentioning? I haven't played the game, only the first one and would like to see if it's worth buying. I'm sure others would, too.

Nothing will ever top this moment, fanservice at its finest

Hyrule Warriors for me, but I'm a Zelda fan so... I haven't played any of the PXZ games, but PXZ2 looks good.

One of the funniest (if not the funniest) moments of my entire life as a gamer. Some peolle got pretty pissed off and didn't buy the game, but I absolutely loved it (both the game and the joke).

Well, it's a crossover fanservice game, so it does certainly accomplish its goal in that regard.

This image alone sums it up for me:

Decently funny joke if you played the series and get the joke in a very flawed game. Best fanservice ever though?.... Not really.