yes theyre in japanese, so you want to be careful about which you buy. some it doesn't matter, and the japanese Super Mario Bros. 2 (i.e. the REAL SMB2) should be the first you get. But as for anything text heavy, hope you can read japanese!
VC games I've bought on the JPN Wii
SMB
SMB2 (JPN)
Kirby
F-Zero
Donkey Kong Country
Super Mario World
Super Mario Kart 64
I mostly use emu's on the PC so it wasn't really necessary that I bought any of these, but I wanted to try it out.