You can use the touchscreen to navigate your M3 Real.
I have tried quite a few games even the often cited as non-working, Mario Party on download play using the download play button and it works fine.
One real issue is that using Soft Reset will increase the likelihood of a freeze in certain games (Mario Party 3rd level boss is one of them). Could be fixed in an update.
As far as the "crap build quality", don't order your M3 Real from a crap place.
Mine is fine. It is not flimsy. It does fit in the DS. It is fine. My rumble pack did NOT fall apart.
A lot of the "issues" I've been reading in this M3 forum is just from ignorance, really. Put a bunch of them together though and someone might thing there's a serious problem. There just isn't.
Game On!