Trying to revisit games I enjoyed as a kid, I just realized something I liked about "Might & Magic" (the dungeon crawlers, not the turn-based strategies). They had a ton of enemy types in them, and each type had always the same stats. Even though you couldn't see the stats without using a special action, the game allowed planning ahead. The occasional frustrations I remember came from this deal being broken e.g. when a much stronger enemy type was unexpectedly present in a low-level area.