Wii- it made me come late to the HD era (PS360)
Wii U- it really needs more games besides nintendo titles.
Xbox One- up until now i really don't have much use for it.
PSP- eventhough it did better then its succesor, it died real fast.

None really! I thought the Wii was a disappointment of a system, but I don't regret buying it since it still had many good games!

xbox360. i was hoping for shen mue 3, but it never came... and the games that came were mostly bad, like halo, or lame like gears. had much more fun with the original xbox(even if its the console of that gen i like the least)

Nothing really all the PS systems were great.

Definitely the DS.

The Game Boy advance. Weeks later the Game boy SP was released.

I don't know If I regret the actual purchase, but its been too long since they last released (hell even announced) a game that I've felt I needed to play on my PS Vita. But the first year I had it especially, I had lots of fun with it, definitely not a bad console.

Maybe even the Wii? Other than Super Mario Bros. and Wii Sports/Wii Sports Resort I pretty much only played 3rd party games on it xD. I didn't have a PS3 at the time so I was stuck with the usually inferior 3rd party ports of CoD (WaW I'm looking at you).

Gameboy Advance original model. Preferred the Gameboy colors lighter screen and games being $30 and never coming down to $20 irritated me so i have only a few games for it.

The Wii. Had it about 4-6 months then sold it to a work colleague for profit.

The Nintendo Wii, back then i wasn't into buying that many games, plus the games that nintendo offered were pretty lame for me. Once i got my 360 i was enjoying everything out of it, but then i got the PS3 and well my 360 became the wii 2. The PS3 has been my main gaming console since then.