As a conjurer I expect to be able to summon clanfear, daedroth, spider deadra, xivalai, wraiths and gloom wraiths, bone walkers, winged twilights, liches, etc. Skyrim's only one summon for each type of elemental attack, plus one weak melee wolf and then overpowered dremora lord twins as the reward for slugging though 100 levels of conjuration is just too limited for my tastes. Dawnguard helped some by adding a few more summons but you have to slug through that questline to get them and deal with random vampire attacks on my cities. Overall, Skyrim suffers from lack of variety in spells, and it is particularly noticeable in conjuration.
Actually, the character I had that used bound swords was more of a nightblade than a conjurer, using illusion for invisibility, muffle, and quiet casting and conjuration for bound swords. Worked great until the level scaling made the enemies outlevel the damage from his bound swords, then it kinda svcked since he could no longer kill much of anything with a sneak attack cause all of a sudden everything had too much health, cause of the leveled/scaled world.
That's what I meant earlier when I said your character gets weaker as you level up. Same character I'd been playing all along -- who at lower levels was a badass, all of a sudden is no longer badass. He can't kill anything the way he used to be able to since most of the enemies he was facing all of a sudden had more health. It's a product of a leveled/scaled game world and a weapon that does not have a good method of scaling damage.
Oblivion had the same issues of an over scaled world and limited ways to beef up your character's damage at higher levels, and they did not really fixed the issue Skyrim. Well, they sort of fixed it since you can use smithing to scale the damage of your weapons as much as you want, but when it comes to bound swords, they nerfed it.
Sure, he could switch to summoning atronachs and dremora lords and such, or he could switch to a nightblade who uses physical weapons, but that's a poor solution. If they are going to nerf bound weapon damage in relation to physical weapons, there should be an option in the game world for a more powerful conjurer to summon a more powerful weapon (at a higher magicka cost). I suppose you could argue that one handed enchants do just that, but that's only a partial solution. The route I eventually chose was just to mod the heck out of the game so my game looks nothing like vanilla.
Heavily modded is pretty much the only way I will play Skyrim these days. And the game is a dream with the right mods.