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This is similar (or more or less the same) idea that has been advocated by Uncle Bob and others. Here's my comment on the experiences we have had with this approach: https://news.ycombinator.com/item?id=6470693 (the topic was about running tests quickly, and the approach, as mentioned also in the article, decouples the business logic from frameworks - allowing testing without firing up web server, database, etc.).

I agree that the interactors make rather odd-looking OO classes, but I suppose the imperative nature of most requests to perform some logic make them less objects in that sense. This has the added benefit of seeing what the system does, just by looking the class names in the interactors folder/namespace.