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Withers are pretty stupid because you summon them like the bosses in Terraria. The bosses in Terraria are fine, but Minecraft shouldn't rip it off.
Would be much better if they had lairs or something you had to watch out for while you explore the Nether. In fact, all bosses should be found through exploration. Gives you a reason for exploring in the first place. Following this rule, The End should be a fully fleshed out dimension and you have to explore it to find the Nether Dragon's lair where it lurks. Make that boss fight better than it just flying around in circles like a goon getting healed by the dumb towers.