My 4 year old has chores that she does, a majority of them she likes doing, but some of them she doesn't.
My friends think I am unfair, they don't ask their children to do anything. It might be important that I am not English, so could be cultural. We certainly had to do a lot more when growing up.
Her chores:
Things she likes doing:
Setting the table
Shelling peas
Chopping veg
Putting washing in the washing machine (I do the powder and softener, she just likes sorting the clothes)
She loves wiping things down with a cloth. (Notably my freshly painted white wall with a cloth she'd just used to wipe tomato sauce off the table) 
Feeding her cat and fish
Things she doesn't like doing:
Tidying her room
Putting her shoes away in her shelf
Washing her toothpaste off the side of the sink
For me, I would be happy for her not to do any of things that she actually does like doing, I don't think they are important for her to do but she does ask to do them. However, the things she dont like doing, I think is important for her to do. I think 4 is old enough to tidy your own things away. She is nearly 5, so not a young 4 and is at school, so I feel she probably does tidying at school too.
Is this too much? Do your children do similar?