I feel the same as OP in regards to spelling mistakes. It just erks me so much that I find it really hard to continue reading.

If someone hasn’t bothered to take the time to proof-read their work, what does it say about the topic they are writing about? I don’t mind if the mistakes are because they are learning English, but I’m talking about really obvious spelling mistakes.

Not really. Writing style is an inherent part of journalism.

`s/\!\+/./` would cut it, though.