Regular Wanda can't turn anyone into Lego cubes... she's lucky if she can avoid getting kidnapped or knocked out by the villain of the month (even by Avenger standards, she's really, really easy to kidnap).
It shows how much of a shadow House of M has cast over the character that most people, working in all media, think she is either omnipotent or at least potentially omnipotent. Even though for most of her career she was never considered one of the Avengers' most powerful characters. Another thing she and Jean "Phoenix Forever" Grey would have to talk about.
You can see the writers' cluelessness in action in Avengers vs. X-Men where her power level changes from writer to writer and even sometimes within the same issue. Bendis actually got her power level more or less normal in his 0 issue, where she needs Carol and Jessica to back her up, but then other writers are having her teleport and Lego-Cube Namor and nobody even mentions that she was depowered in Children's Crusade.
It's just a mess, though the only thing Remender got right about her was trying to find an excuse for her wildly fluctuating power, positing that she needs massive sources of extra energy (like the "Life Force" or Wonder Man's ionic power) to make her massively powerful. Other than that, though, his writing of her is generally agreed to have made her worse off than she was before, even before the Magneto retcon that was forced on him.
Wanda and Pietro were retconned into not being Magneto's children because of the MCU, but because their rights were shared, they were still included in the ban on promoting mutant characters. It's really the worst of both worlds for them.
Wanda also turned Nuke into lego cubes.
House of M, Civil War. Bucky, Nuke and Mimic (the 3 are humans) attack Genosha. Wanda kills Nuke.
It depends on the writer because her power set is so crazy inconsistent, but in most of her incarnations she couldn't teleport, transmute, or even levitate. (The Official Handbook of the Marvel Universe claimed that any stories where she was able to levitate or transmute objects were mistaken.) Her power was "probability manipulation," which could mean anything, but usually meant she couldn't completely break the rules of the physical world the way real magicians could. Very different from Zatanna, who can do literally anything if she says it backwards.
In JLA/Avengers she gains powers like teleportation only when she goes to the DC universe and accidentally taps into the Lords of Chaos's magic, and some fans have used that as a fanon explanation for why she was suddenly so much more powerful in Disassembled/House of M.
But every writer makes up his own power set for her so it's hard to generalize any more.
Why are we still blaming Wanda when it was Pietro taking advantage of his mentally disturbed sister?
Pietro wasn't supposed to be the one who made her say "no more mutants," though, except indirectly by dying.
It is true though that Pietro didn't really get a lot of punishment for his many crimes in HoM and after. Peter David finally addressed it by having him confess publicly, and the result was... he remained an Avenger, suffered no consequences, and won back the respect of his daughter.
It does kind of seem like Pietro has been punished more than Wanda though, even though he really hasn't. I think it's because he was in the comics after House of M and she wasn't. While he got off easy, he did hit a low point as a human being and a hero, and fight his way back to become a hero again in books like Mighty Avengers and Avengers Academy. If Wanda had been in the comics around that same time, no matter what she was doing, we'd feel she had suffered enough. Instead she was "redeemed" with no stories behind her belt except a few issues of Children's Crusade and a few issues of Avengers vs. X-Men.
Imagine if Wanda had been with Pietro in Mighty Avengers and Avengers Academy and no matter what she was doing, she would be better off now. There's no substitute for actually being in stories to make a character move past their old stories.
I always come back to saying that Wanda's biggest problem is those years when she was not allowed in the comics. It cut her off from the Marvel universe at a time when a lot of the "modern" MU was being developed, and now she has almost no relationships explored or re-explored. (She was Carol's best superhero friend but they have literally never spoken to each other since 2012.) This may never change.