Man, MAD is one of those hidden gems that starts strong and only keeps getting better. The post-apocalyptic setting filled with aliens isn't anything new, but it's executed very well. There's a strong focus on the people - the survivors - and what it truly means to be human in such a world. For me, the characters are what stick with me the most - and let me tell you, they're fantastic. We get a broken protagonist who has to confront his grief and fear, genuinely "MAD" and unhinged antagonists, and kind, slightly quirky side characters. And this is important: the female cast isn't sexualized or reduced tocheap fanservice. They're genuinely well-written, and even though there's a fair amount of exposed skin(for story-reasons), it's portrayed in a natural, mature way.
Another highlight for me is its sincere portrayal of male friendship - it feels honest and adds to the emotional core of the story.

The art style feels pretty raw, which perfectly complements the consistently dark atmosphere.

There's so much more I could say, but that would only take away from the experience of reading MAD for the first time.
Do yourself a favor and check it out.