If I own Mario kart, should I buy Modnation Racers?

[twesterm]

scottie said:

Thanks Torillian. I'm not overly bothered by aesthetic user generated content so I think I shant get the game Edit: At least not immediately, I'll wait to see the calibre of levels that can be made and maybe wait for a price drop

@ twesterm - They are some good examples of games that you would want to own multiple similar games.

However, can you really say that if you owned Mario Kart: Wii, that you would pay $50 for Mario Kart: Double Dash? What about Pokemon Black and Pokemon White? Nintendogs: Labrador and Nintendogs: Poodle?

Fact is, all the games you pointed out (except the shooters, which in the case of Battlefield vs MW2 they are completely different games anyway) are plot based games that have a start point and an end point. Mario Kart and MNR are completely different which is why I am asking if these are the sorts of games where there is a point owning both.

Now see, that's a valid point and it's still fine.  Take something like TF2 and Left 4 Dead 2.  Both games are game with no ending point but it's still worth having even though they're both shooters.  They're both the same genre and really similar games, but they're still different.

Mario Kart Wii and Mod Nation Racers may be closer than TF2 and L4D2 but they're still different enough.  They're both kart racers that are really close to each other, but they're still different games.  If you like that type of game then there's no problem getting both.