I think the app looks great and compared to the desktop/mobile versions of the Wikipedia website, it is a significant improvement when it comes to readability. So what if it doesn't do justify or support editing content. Justify is a minor setting that can be easily implemented and editing could be a v2.0 feature if the project gains traction.
I love reading Kindle and iBooks on my iPad and it's fantastic that I can now access Wikipedia with the same readability features. You should definitely continue to make improvements, from tables to justification. Keep adding more integration with Wikidata. Maybe allow users to treat any Wikipedia article like an e-book by enabling notes, bookmarking, highlighting etc. I know it's hard to deal with ever changing content but maybe let the user save a specific version with highlight/notes to the iPad (and enable cloud sync).