I absolutely don't like being married to Aela. She's too quiet when following me for my taste, and she sometimes doesn't attack enemies who are attacking her.
This can be a problem, but she is very quiet when sneaking is required. My Aela is glitched, however. She only provides home-cooked meals while in dungeons (!) and I can ask about the store only if she's dismissed, and it's only ever 100g, no matter how many days pass. Wasn't always this way. Also, dismissing her means that the next time I take her out, she'll be using that crummy bow again. Perhaps it's just a graphical glitch, and she actually uses the legendary bow I gave her.
I have to admit she's surprising in combat situations. Long ago I obtained some sort of staff. I prefer my bow, thank you, so gave it to her, thinking I might sell it. I don't recall which one it was, but probably a frost type. Then i found a chain-lightning type and gave that to her. Imagine my surprise when I shot an arrow at a bandit and lightning and frost bolts were streaking by me! She loves to dual-wield staves.
Eventually she had a firebolt type, but continued to use the others. That is, until we came across a troll. Then she put away the frost staff for the fire staff and two-shotted the thing. After that, she put it away. If she only has one charged staff then she'll revert to her bow at range, but will use the staff in lieu of a shield in melee, especially the one that sprays a continuous flame. Very amusing for me to paralyze a draugr deathlord with my axe only to have her alternately stab and toast him, while taunting him with, "Is that all you've got?"