Believe it or not but the bunnies actually used to be pretty mediocre, when they were initially released they gave themselves a -25% def ailment, and Lepus was average speed instead of fast (Jack was slow! lol): 1.11 Release Notes & Status
Balance changes:
- Master Lepus - Special defense reduction from -25% to -20%, mana speed from average to fast, base attack slightly increased;
- Jack O’Hare - Special defense reduction from -25% to -20%, mana speed from slow to fast, base attack slightly increased;
- Squire Wabbit - Special defense reduction from -25% to -20%, base attack slightly increased;
IMO the way they are now is fine, I like how high their attack stats are while still being fast. The def- drawback is kinda nice as it makes you think before tap tap tapping as most do. There are certainly much worse heroes than the bunnies in those respective rarities.