Out of Adachi's 3 big baseball mangas, H2 is the worst.
The flaws include bad pacing, and an unrewarding ending after beign dragged over 300 chapters. This is a tricky read, like some of Adachi's other works it has a drop of quallity near the end, and obviously some very bad humor and filler pages.
The pros are that the side characters are nice and had some nice back story, even if they are forgetten after their respective arcs.
But the biggest flaw is that you feel like Hiro and Hideo don't evolve a lot during the manga, you don't see a real development, Hikari and Haruka you can see some development, but Hikari is just near the end.
So the final judgement is 6, by no means this is a bad manga, but when you have Cross Game this is not a read i would recommend.