Which unique techs do you think need to be changed? Why do you think they need a change? How would you change them?

With 68 UT's in the game, there's definitely some that are underwhelming or just not healthy. But some civilizations like the Huns do just fine even with weak UT's.

So, just to get some discussion flowing, what unique techs would you like to see changed, why do you think they need changing, and how would you change them?