@skomfare2 PS on a side not, if you want to build reviews like that for real it comes down to offering excellent support more so than a great product. A great product will drive reviews but great support can make reviews grow very quickly.
That said you should never tell someone that it definitely wasn’t your plugin causing the problem. Suggesting their theme may be the issue is ok, but from my experience( 5+ years on wp.org ), throwing the blame elsewhere right off the bat will likely result in negative reviews. Always begin with something more like I would be glad to help track it down with you and if you determine after looking at it that the theme is the cause, then make that assumption. You are much more likely to get rewarded with a good review that way.