Still don't know what to think of Waluigi in WarioWare, but I'd like it if there were more Waluigi microgames, even if the Purple Wah himself isn't present.
I'm kind of against Waluigi showing up in either Land or (more likely)Ware. He just feels too much like a Mario character to me and it would feel like inserting more Mario stuff into DKC than there already is.
That being said, I would be open to seeing Waluigi with Wario in a new original game of some kind.
If Waluigi ever got in Warioware, I would assume his microgames would be about causing "evil" schemes. Like how Wario's is mostly about treasure hunting and eating food, Waluigi's will be like...tripping over an old lady?