Having read the comments on the walls, I don't see what the problem is. Almost all postive comments. Perhaps a "ho hum" comment but that's hardly devastating. No trash talking that I can see unless there were comments that were moderated. If you expect only universal praise, I'd suggest that's an unrealistic expectation for any work.
Don't be surprised however if some people aren't thrilled with such logos and windows related text on walls, if for no other reason that they've been overdone. And if the wall is an attractive graphic, some simply prefer not to have text etc "cluttering" it up. Tastes vary. But others still do like them with logos (if the wall is pleasing to the eye). Used to be a joke that if someone wanted a lot of downloads, just slap "Windows XP" on a wall.
Since the XP thing has been so overdone at this point it's grown a bit stale and that may no longer be the case. In some cases the wall must itself be remarkable enough that it works without the text and logo and if that is the case, some will find the text and logo entirely dispensable.
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