Come for the Spiderman-style webslinging, Battlestar Galactica-style secret plots, and Godzilla-style kaiju battles.
Stay for the meditations on intergenerational trauma, the cycle of violence, and free will.
In Japanese, the title of the manga (and later the anime) is 進撃の巨人 or Shingeki no Kyojin. This translates literally to "The Advancing Giant" which I think is a much more evocative name.
It can be taken literally, sure. The titans are giants that are ominously advancing towards for the characters throughout the series.
But there are also metaphorical giants coming for all the characters: war, nation states, revenge, history, fate, and death.