If you really like Earth-2
This will be a 5 criterion, pass or fail review, each criterion is worth one star
Story: Fail
Basically, we find out why everyone hates Terry Sloane, and not much else. This is very important character and world building, but really, Sloane has too much internal monologue, and not enough happens to be worth a whole issue, especially since this is a one-shot.
Art: Pass
The pencils are nothing too special, they certainly don't just feel beautiful the way Nicola Scott's do, but they're definitely not bad in any way. The colors fit the tone of the story well. Also, Mr. 8 and Batman look neat shooting guns together.
Scripting: FailSloane's monologue dominates the text, and dialogue is mostly cliched.
Feel: Pass
The whole feel of the issue does fit the vibe I get of Earth 2, a place very different from and similar to our own, and somewhat sorrowful, but full of power and where decisions are always important.
Should You Buy This: Toss Up
If you really like Earth-2, and want to know everything about it and the characters in it, then you definitely should not pass on this. Otherwise, save your money.