Tom Chick has a review of "God of War: Chains of Olympus" in today's Daily Variety and he's definitely not as kind as most other critics seem to be.  He definitely doesn't hate it, but he finds the formula is getting a bit tired and is certainly not improved by going handheld:

“Chains of Olympus” is a short game and there’s not a lot of variety to encourage replay. The previous games offered a nice spread of weapons and magical abilities, but this one has a pared down feel, with only two weapons and three spells. The only new weapon is actually pretty silly: Kratos dons an oversized glove that looks like something a football fan would wave from high up in the bleachers. There’s not much variety in the different enemies, many of whom are carryovers from the previous games. There are a couple of memorable set pieces, leading to a dull final level and a disappointing climactic fight.

You can read Tom's entire review here.