Request to referee from obscure journal (physics) I have received a request to referee a paper submitted to a journal I hadn't been aware of before. The paper is in my area of expertise, and I've been working in the field for a few years and read arXiv &amp; major journals (nobody I know has published there, as far as I know). Though to be fair it is published by Springer Nature and has an impact factor of about 2.5.

I'm reluctant to accept the request, because (i) it would cost me time, (ii) I never read the journal, (iii) the abstract is badly written (grammar mistakes, and it's of the form "We use standard methods to calculate some properties about a standard system, which have been discovered in many slight variations before").

Is it okay to reject review in this case? I'm afraid that my judgement may be off.
I would recommend you have a look: If the submission is as bad as it looks, you will not have to devote much time to it anyways.  Someone has to do some refereeing else nobody would referee my papers so my rule of thumb is: I referee as many papers in a year as the number of referees needed to review my work that year.