Your review questions why Harry went after the Death Eaters in the marshland after they set fire to the Weasleys’ house. In the book, this does not happen. However, Harry’s motivation is likely because it was Bellatrix Lestrange who killed his godfather Sirius in the last book. So he could have been after her in particular.
I can certainly understand Harry wanting to get Bellatrix Lestrange. On the other hand, I would also like to see Harry at this point in his development exhibit at least enough judgment and self-control to think twice about taking on (a) a foe like Bellatrix Lestrange (b) plus at least two other Death Eaters (c) at a time and place of their choosing (d) in a dark, low-visibility environment (e) without knowing whether he’ll have adequate backup himself.
All Harry’s actions accomplished was to leave the Burrow unprotected and vulnerable to Bellatrix’s arson. It would be nice to see Harry be a little less reactive and a little more strategic. That’s all.