I would say yes if you really enjoyed oblivion. These are wot I have bought.
Fighter's Stronghold - Very good, some fighting and then you get your own castle to explore and upgrade.
Horse Armor Pack - Expensive for what it is, horses look great with it tho.
Mehrunes' Razor - Huge underground mining camp to adventure in, and a lengthy quest.
Orrery - A quest to repair the Arcane University's Orrery. Average at best.
Spell Tomes - New spells and books included in random loot lists. You just have to explore and find them.
Wizard's Tower - Waste of money for me as im not a mage. A new house for your character.
Overall I really liked the mini DLCs and they are worth it.