Yes, you didn't paid for it, it is not a comercial product, it was made "usually" to be used by the person who made it that decided to share it with others who might like it. You didn't like it than it's all ok, it was not for you. But why do you feel you have to criticize someone else's work that was free and no one made you download, install and play with it? The right thing would be try it out, don't like it, don't endorse/like it on the site you got it from, unistall it and move on.Anything and everything can be criticized. I'm not the one putting mods out there, if I was I would expect criticism regardless of whether I'm brilliant at modding or not very good.
Way to presume about me anyway Shoe. I know what goes into mod making but at the same time I don't feel it's relevant to whether I can criticize or even offer an informal opinion on a mod or not.
If I offer valid criticism to a mod I'm suddenly entitled? I see a mod I like the look of, download it then find it's not quite to my liking, but I can't say anything about it or I'll sound entitled?
It's almost the same as a beggar criticizing someone who gave them some money because it was all in coins and not bills. People make mods for themselves mainly (at least until Skyrim Modding, which somehow evolved into being a popularity contest for some people) and share it with others, no one makes you play those mods.
Now I don't mean that users can't have suggestions and opinions, everyone deserves to have those, and most authors will like (and even want) some constructive criticism. But there is constructive criticism and then there is going around saying "Your mod sucks!", "I hate your mod!", "Why did you put that feature there? I hate it and it spoils the mod!", "Do what I want because I am a mod user and I am better than you!", "Change your mod to do this instead because I know better.", etc.
Remember how many people around here (even non modders) were annoyed at the console users nagging modders to port their mods into consoles? It is the same.
Modders do what they want, the way they want, they are not working for me or you or someone else, they are working for themselves and if a user doesn't like it just move on, it's not like someone forced you to use those mods and expect you to like them, or forced you to write a review about their product.