I didn't hate it, but I can't say I loved it either. It's definitely as much a platformer as a puzzle game, and I've never been a fan of 3D platforming in the first place. That said, there are definitely some great moments buried in there. It's just a shame the environments are so repetitive and the VO so painfully unfunny...
Quantum Conundrum
Whilst the humour isn't to the same gold standard we enjoyed in Portal, it is still better than the majority of titles out there (you guys are so spoiled), and there are plenty of hidden pop culture and game references that pop out of nowhere and give you a giggle.
Another thing I didn't expect is that this game is much harder than Portal and Portal 2. The majority of the puzzles are more complex than a lot of the Portal and Portal 2 levels, and the Platformer aspect of this game is not a joke: many levels expect skill as well as brains.
However, this game does not have much replay value - unless you really, really enjoy it and want to complete the time challenges - but I would certainly reccomend it at the corrent price and doubly so if it goes on sale.