I don't have Dream Team yet... But I always go back to SM3dL and NSMB2 for platforming fun. I've beaten Luigi's Mansion 2 many, many, times. I love that game a lot. I still enjoy my Nintendo 3DS system.
Dark Moon continues to be one of my favorite single player experiences if I feel like exploring in short chunks (Multiplayer has worn a little thin on me at the moment, but I still enjoy it), don't have Dream Team but still want it, 3D Land I've complained about enough already, Mario Kart 7 is still enjoyable and entertaining…I think I've covered the bases...
I haven't touched LM2, NSMB2, SM3DL, or PM:SS since I beat them. I mean I did play LM2 and I played it a few months ago, but it was multiplayer, which as fun as it is, it's glitchy.
Let see...I haven't played Luigi's Mansion Dark Moon in a LONG time (maybe since November or October of 2013), I've gotten bored of that game already. New Super Mario Bros 2, I gave that to my sister (since she loves playing the NSB series, had the original one but it got lost somewhere and we don't where it is) so I don't play that game anymore. Paper Mario Sticker Star I still play occasionally. Mario Kart 7 I have played sometimes (still wish they had more characters and cups). Have Mario Kart 8, played that a lot. Super Mario 3D Land, haven't played that game in about a year.