I'm not exactly a Nintendo kind of guy. But, as it stands, I very well might be soon.
A franchise that I have followed since "Monster Hunter" on PS2 will be handed over to Nintendo for future releases. MHFU on PSP was the last one I bought, yet the franchise has continued to the Wii and 3DS. Looks promising too!
Below spoiler is a mini review/guide type thing if you're interested!
All in all, if you're looking for a game you can pick up and put down whenever you want I suggest getting one of these games. Lean towards the later games such as MHFU (More and better monsters imo) on PSP or MHTri (Underwater fighting) on the Wii.