I have no idea if the original Onslaught event was any good, but Marvel have a worse batting average than DC with "event" comics, and it's taken ten years to revisit it, so I'm guessing it wasn't an overwhelming success. Marvel have a way of recycling even its worst excesses after enough time has passed - whoever thought they'd pry the lid off the toxic can of worms labelled "Spider-Man Clone War" so soon? Don't they ever learn from their mistakes?
So while it could be worse, it does seem that getting together Jeph Loeb and Rob Liefeld on the microwaved leftovers of Onslaught is the dream team of suck.
And no, I don't plan to review it. It is enough for me that it exists.
And yes, I know some of the proceeds go to a worthy cause. But that won't magically make Rob Liefeld a good artist (as can be seen from the cover image), or give Jeph Loeb any original ideas. It will just mean that some people will buy it despite the suck.