when it comes to opinions about comparing versions of the game, how much credit is giving to those who didn't even play the version in reference?
also for example how many of those playd multiplayer vs single player because i believe both play styles are completely different.
in multiplayer generally people want a fair, balanced game where everyone has the same advantage vs single player where most people turn on god mode.
so, when i post something im generally referencing the multiplayer community pve and pvp.
You are mixing multiplayer with PVP. In co-op multiplayer, balance and advantage aren't usually as important. It is fine to have people with different builds that play differently. It is when it is PVP or competitive that balance is really important. In this game, where it is designed for co-op, there isn't anything wrong with different weapons having different uses, where someone using one weapon is going to be potentially better than someone using another, at least in certain situations.
You also make a wholly incorrect assumption that most people play god mode in single player. Unless you only mean they enable it once in a while for something - such as because they are looking around a map they made to check for problems, or are testing a POI for bugs and aren't really playing the game. For normal gameplay, I am pretty certain the vast majority of solo players do not use god mode.
Regardless, opinions are still only opinions. What one person likes, another will not. Even if you're only talking to PVP players. And you definitely will have different opinions if you talk to both PVP and PVE players. As far as whether or not someone's opinion is worthwhile because they may not have played a specific version or a specific mode of play (single player, multiplayer PVE, PVP, etc.).... everyone's opinion is valid. Most gamers have played many different games and know how things work. And even if they haven't, they know what they like. You may occasionally get someone who changes their mind after trying something different, but people tend to be set in their ways and prefer certain things and you won't change their opinion.
PVP shoots itself in its own foot. It purposely makes other people hate PVP due to how much of the community treats others. Things like killing people who are low level or preventing people from accessing something like a trader or just being jerks to everyone. As long as PVP acts like that, it will never become popular among the majority of players. It is possible to play PVP and treat others with respect, and if PVP players did so, there would probably be more people interested in it.