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The guy I got it off had identical auctions selling 9800 pros, and soon as I saw a buy it now price of £90 I instantly purchased it, only to realize that I got the se instead of the pro... Bah
All was not lost though, I softmodded it and managed to unlock the extra 4 pipelines of the pro version (since most se's are just castrated pro's)
And it's now running almost at pro speeds, for a fraction of the price :).
Now it runs doom 3 and half life 2 at stunning frame rates at high settings at 1024x768..
Celeron's aren't good for games. That's probably why the game advisor thingy says it's insufficient.
I'd imagine you could get away with it in HL2 though.
Although, like Damarus says, performance will also be dependent on your other components.
What are the other specs of your machine?