Skyrim's magic was so gutted. In oblivion, you could summon every piece of armor, every weapon type, almost all undead creatures, hordes of deadra... In skyrim: 3 atronachs, 1 deadra, 3 weapons, no armor, and a ghostly wolf.
Every school of magic needs a lot more spells
So you ignore half the conjuration tree and wonder why your options are limited?
Draugr, Restless Draugr, Draugr Wright, Draugr Scourge and I think Draugr Overlord can be reanimated.
Skeletons can be reanimated if you don't blow their bones all over the room, which is admittedly unlikely. But skeles you find as part of the environment are fair game.
All animals are open for reanimation, except Mammoths (level 38). Seriously, I fought a dragon with a goat once.
Chaurus, Chuarus Reapers, All Spiders, Spriggens, Spriggen Matrons, All Trolls and the few dead Werewolves can be reanimated.
Falmer, Falmer Skulker, Falmer Gloomlurker and Falmer Nightprowler can all be reanimated.
I believe Hagravens can be reanimated, though they usually occur at the end of a location so that's rather useless.
Additionally, nearly any NPC can be dead thralled (Falmer are not considered NPC's).
These are all based on base levels for the reanimate spells. Some extras could pop up with Necromage perk.
There's plenty of things you can conjure in Skyrim. To say there isn't is either a lie or laziness on your part for not trying to see what you can use. Now if you want to argue the effectiveness of Reanimate XXXX that's a separate issue, and one that I'd agree with. But that's not a matter of not having the spell, its a matter of needing a body to cast it upon. Those spells should have a much higher duration. Additionally, there should be a couple that you can cast "out of thin air," similar to the atronach spells. And for the record....
Spoiler Dawnguard gives you a couple of these like Boneman Archer and Wrathman (2H wielding Skele). Oh and a conjurable mount...