Metal Wolf Chaos is funny, maybe even accidentally with the awkward writing and voice acting but it's done in a very lovable way. Gameplay wise it's pretty basic but fun... until you get to the final bossfight which can stunlock you to death. The difficulty there is very artificial and there's no checkpoints which makes it very painful to fight against.
It's worth it for the story, dialogue and voice acting but that boss left a sour taste in my mouth.