That's not how liking things works you little shit.

I kinda see where they might be coming from, in that Aang and Steven both pulled a bullshit last move where they spared the life of the insane genocidal conqueror because they didn't wanna for the finale which is the biggest complaint point of the show, but there are differences:

1. At least Aang threw Ozai's ass in prison. He didn't get to KEEP his giant shiny empire after being such a bastard.
2. I actually do complain about both of those decisions equally, it's just that Avatar had a preceding three seasons of pure gold to fall back on and at least gave us a visually interesting action scene for the finale, while SU had five seasons of 'eh' leading up to asking nicely.