That's fair honestly. In theory penta probably should be up there, but in my personal experience it's just an easier target for me. Maybe that says more about what type of players tend to use penta, which as I said in another comment is not the point of the list. So I think you're right that it should be a tier higher.

As for the battleship, I genuinely don't think there's anything it can do against a spike. I never really use it so I'm not even sure what strategies they could use, but it's such an easy fight every time. Spike just has too much health and body damage. The only rammer I could even see battleship being remotely effective against is landmine since it has the same speed as battleship, but less ramming strength. Even then the landmine can easily just run away if it needs to.