Hopefully you've read the original series before you read my review!
As far as a sequel goes, this wasn't my favorite. It's good, but I enjoyed Gunnm a lot only to be somewhat let down by this. A lot of those characters that you enjoyed in Gunnm are really no where to be found, replaced by characters that just didn't grab me as much. The story kind of drags in my opinion and that's probably why my enjoyment isn't as high with Last Order. Alita doesn't occupy as much as the spotlight, instead we have volumes dedicated to the past and other supporting character which just isn't as interesting to me.
Also, Kodansha if you read this, please publish this as a Hardcover with all the volumes included! The original series looked great in Hardcover, it was disappointing going from that to the omnibus paperback format.