Read the start, some quick advice:
- Although it's fine to get right into the nitty-gritty you should probably make some sort of acknowledgement of audience, stakeholders, purpose/contention, how the issue arose just to orient the reader as this will inform most of your analysis.
- Careful not to evaluate the effectiveness of the piece - this is not your task!
- Always explain why the author is using something in a specific way that cannot be lifted and applied to another example of statistic use, for example.
- Don't think you have any major issues with essay flow.
- Very good though (I'm not just saying this) and I think you should be able to pick things up very well
An intro could be something like this:
After the recurrence of blah blah blah which prompted a media furore and much public outrage (author) responded with an opinion piece to try and dampen the public backlash. Writing as the (someone with a stake in the issue) she/he attempts to convince the general public and those affected directly by the situation that the changes are minor. The piece appeared in The Herald Sun (date), appropriate for maintaining the paper's right-left wing balance.
Done, concise and that would be an intro out of the way, no fancy shit. I hope I haven't missed something

^ This doesn't relate to your article, I just made it up then (and it was fun).