Defensive items feel significantly worse than offensive ones
I often feel like if I only get negatron cloaks, armors, and health items that my gameplay seriously suffers compared to when I, or my opponents get offensive items.
The defensive items can be really good, but they seem more situational than the offensive ones that just seem mostly good no matter what. In a mode where that isn't up to you, though, getting stuck with all defense really hurts.