I decided to write an answer in the hope of clarifying the question a bit. To be honest, this isn't an answer, just a really long comment. Irony I guess!
Here are our canned comment options, with the "really" comment highlighted
When I first began reviewing the Low Quality Posts queue, I found the "really" in that particular comment to be illogical and confusing to the reader, since most of the posts I was seeing that fit the description of "I'm having this problem too" were not sort-of answers, they were just not answers - the writer had no intention of answering the question.
After a while, I started ignoring the canned comments 90% of the time and just writing my own comment if one seemed necessary.
This question and the response to it led me to think again about the canned comments and the "really" that I'd always felt was unhelpful.
I am absolutely 100% in favour of using friendly language and softening the blow when criticising someone's action, and the comments here and Oli's answer draw attention to that possible function of the "really" in question in a way that made me doubt my first thought about it. One of reasons I started avoiding the canned comments is that I felt their tone was too harsh, or they didn't explain the problem clearly... or perhaps it was just me, a problem of perception on my end - the fact of using a canned comment maybe seemed unfeeling and unfriendly...
I considered more carefully the posts that fit the description "I'm having this problem too". Here are a few where I feel somewhat that the "really" is illogical:
OTOH, here's one I found in the queue today where the comment seemed to fit and IIRC I actually added it myself:
I softened my stance on the "really" after thinking about the plurality of NAAs we get that are like that last one. Sometimes, there is an intention to reply, adding information, and there is a case for saying this sort-of-but-not-really answers the question, so the comment fits. It just doesn't fit them all IMHO.
None of the other comments have a "really" softening their tone.
It's strange to me still.
(And it really was TL)
Since "really" is sometimes illogical, I feel it would be better to have something like "this doesn't seem to answer the question", which contains an admission that the commenter might be in the wrong, without creating confusion by suggesting that something that is not even intended to be an answer is sort-of an answer.
I'd noticed that Bhargav Rao who is a mod on Stack Overflow and is involved in developing a bot to catch NAAs, was leaving much better comments that the canned ones. He told me they come from here and showed me the bot's full list of comments. For this type of answer, the comment is:
Please don't add Me too! as answers. It doesn't actually provide an answer to the question and can be perceived as noise by its future visitors. If you have a different but related question then ask it (reference this one if it will help provide context). If you're interested in this specific question, you can upvote it or leave a comment once you have enough reputation
I think this is much clearer and more helpful than the canned comment and I will be using it from now on.