The reason why people dont think highly of ranger is because its heavy gear reliant. But mostly of all its by far the hardest class to play and probably to Master as well.
You need to practice slideshot , jumpshot mechanics, animation cancelling your skills. Perfect distancing and kiting towards and away from your opponent. I respect Good Rangers a lot , because I know that they've practiced a lot to get were they're at now. But dont be discouraged , you can look up some video's on youtube on how to slideshot , pvp rotations, I suggest you look up some video's of Kupyd and copy his style. The best ranger I've ever seen. The pvp meta for 6V6 group pvp is based of heavy single damage or aoe damage dealers like gunners and gladiators with 2 clerics and a cc class like a spiritmaster who can cc the opposite clerics or healers. Sadly I do not think that Ranger has any place in 6V6 , I believe its simply too inferior compared to other single target damage dealers. So sadly Rangers dont really have any space in a heavy competitive 6V6 environment. But its a great class to have fun with your friends in Open world or playing Solo. So dont be discouraged , this class just requires more practice, time and effort. But you can do it. Good luck!