I Don't agree with everything mentioned in the review. I was actually pleasantly surprized of Sheva's AI. I'm normally a "if it has to be done right, ill do it myself" gamer, so I was a bit worried seeing I had a sidekick from the start. But that quickly changed.
-Whenever either of us got low health, she used medicine. I ended up giving her all the medicine I found, since healing me is top priority for her if my health gets dangerously low. The itemization seems to alter with your inventory, so when your both low on health, the chances are high that youll find a herb in the next crate you smash. So I never had health problems on my first playthrough (on normal, mind you)
-She seemed to prefer the gun. What did I do? I upgraded hers to make her even better with it. While using all the bigger (fun) guns myself. Its easier to press the O button whenever I came across handgun ammo instead of hoarding it myself. When I wanted her to use the rifle, so I just exchanged her pistol for my rifle. easy.
-Wtf? shes taking mah shotgun ammo! oh! She gives it to me. thats cool. Also, if she has more of the ammo your using, she'll give you more once you get inventory space. (for example, your using up tons firing at a boss)
-She seems to handle herself well in fights. Shes a pretty good shot too. I had no problems letting her handle special weapons like the flamethrower and the aiming laser suring boss fights. I kept her in the cover stance mostly though, making her stay behind me most of the time. Wich is very good if your fighting a chainsaw majini or a reaper.
The inventory thing, well. I suppose each slot can be seen as a separate pocket. You wouldnt want your (extremely valuable) rotten egg to be crushed because you tried to stick a magnum with it, right? The armor taking a slot might represent the wearer being encumbered by it enough to have one less pocket free.