When you like something in general, but there's one characteristic or part that you don't like, you say "I like it except for ___." For example, you can say:

• except for the color
• except for the size
• except for this part over here

When the problem you have isn't with a part, but with an overall quality, there are two ways to express it:

I like this one except that we already have something in that color.

I like this one except for the fact that we already have something in that color.

Another example:

I liked it except that the fish was a little overcooked.

I liked it except for the fact that the fish was a little overcooked.