Constructive criticism and reading the room is key.
Simply saying "your logo sucks" doesn't really do much for anyone. How does it suck? How could it be improved upon? Providing constructive, useful feedback goes a long way and could help with improvement. You may not be able to actually improve it yourself, but sharing what you see wrong with it will go a lot farther than "it sucks."
Location of the criticism matters too. If the forum owner isn't explicitly looking for public critique (via reviews or in a feedback thread on their site or any other public method), then public isn't the way to go. Privately would be the way to go. You would still want to provide constructive feedback, regardless of whether it's public or private, but reading the room is important. I think it's also important to note that it might not be a good idea to be nitpicky about the criticism either. What one person likes may not necessarily be what you like. Maybe you don't like the color choices, but the owner does. Maybe you don't like the design, but the owner does. Unless it's a glaring issue, it might just be best to keep the comment to yourself. That said, if they've asked for a review of their site, giving your thoughts on the logo is okay, but phrasing and how you say it would be important too.
Simply saying "your logo sucks" doesn't really do much for anyone. How does it suck? How could it be improved upon? Providing constructive, useful feedback goes a long way and could help with improvement. You may not be able to actually improve it yourself, but sharing what you see wrong with it will go a lot farther than "it sucks."
Location of the criticism matters too. If the forum owner isn't explicitly looking for public critique (via reviews or in a feedback thread on their site or any other public method), then public isn't the way to go. Privately would be the way to go. You would still want to provide constructive feedback, regardless of whether it's public or private, but reading the room is important. I think it's also important to note that it might not be a good idea to be nitpicky about the criticism either. What one person likes may not necessarily be what you like. Maybe you don't like the color choices, but the owner does. Maybe you don't like the design, but the owner does. Unless it's a glaring issue, it might just be best to keep the comment to yourself. That said, if they've asked for a review of their site, giving your thoughts on the logo is okay, but phrasing and how you say it would be important too.
