Lazy or incompetent?

Most of the reviews I get on my online writers workshop are very thoughtful and helpful. But I've gotten a few over the last *gasp* (Has it been ten months already?) ten months that were not very insightful- I 've gotten the impression that the reviewer rushed.

I've learned a lot in that time, and I'm sure that some of my earlier crits were modestly helpful at best. I know of at least one crit where I apologized for not being much help, but explained that I'd read some of this person's critiques and she was so good, would she mind taking a look? And she did and her review was extremely helpful.

But I got a review last week that had very little detail- I doubted that the reviewer had spent more than five minutes reading AND critiquing. For contrast, I usually spend at least an hour. Sometimes two if it's someone I crit regularly with.
I read part of this person's own submission and it was okay. Not great, but they weren't completely lost. So I checked their other critiques to see if mine had been an anomaly. ALL of them were ten lines or so, all drivel.

I still didn't want to not return the crit, so I suggested that they spend some more time with grammar and spelling and eliminating typos so that reviewers could focus on the real stuff- plot, characterization, etc. And I recommended some good books on writing. I did not read the entire submission- not more than 300 words of it.

Did I do right? I guess that this person wants basically free critiques. And there are some people who gave real critiques in response to her empty sentences. Which is a shame, in my opinion. You shouldn't be able to get something for nothing in a crit for crit workshop. Not every critique is going to be awesome, but I want an honest response. That is valuable. "Dialogue was great. Setting was nice. The plot moved nicely." is not really helpful. A new writer who is still learning is totally welcome to crit me and I'll be glad for their feedback. But I get annoyed if the person is capable of more.