TL:DR - People who don't like Siege [b][u]typically[/u][/b] don't like it because of the learning curve or they just aren't good at it.
Siege is a unique game and I have noticed a lot of people dislike it for no other reason than they are not good at it. Siege is [b][u]TEAM BASED[/u][/b] and I have noticed a lot of people try and play this game like Cod/Destiny. You can have strong solo players but you simply can't just run around all over the place like other shooters.
Gunplay is realistic in the sense that the TTK is low because it mirrors real life. Personally, RS6 is my favorite shooter since Modern Warfare 2 because it requires more skill & attention than other shooters. (I wasn't indirectly saying MW2 took skill to be clear)
Just my personal observation.
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Honestly, everything is going to be played by a lot of people, and some of those people will undoubtedly not like it. Just play what you want to play. Lot of people here don't do that, and it's part of the reason this forum site sucks.