What probably works in Wrath Of The Titans' favor is that being a sequel, it is only expected to pick up from where the first left. And thus having approached it with its predecessor in the head, it is quite easy to say it's a slightly better sequel, but with nothing drastically different.
After defeating the Kraken, Perseus (Sam Worthington) manages to live a quiet life as a fisherman, along with his son, Helius. But he's pulled out of his paradise by a war between the gods and the Titans, that threatens to wipe out the world.