No, I mean "soba is desirable/likable". Since from the grammatical point of view "好き" is an adjective.
Then "soba" would be the subject and "is desirable" would be the predicate.
Another example: the weather is nice. The sky is blue. Soba is likable.
Or 車がほしい - of course you can translate it as "I want a car", then the grammatical function of "car" would be an object. But I prefer to think of it as "the car is desirable". In this case "car" is a subject.