There are few groups of premades.
First one are guys who are low geared and do premade because that way got more chances of wining. This premades knows to be funny, esspecially when you win vs geared team. Another group of premades are Neltharion ones. Thats guys who got full bis and they enjoy farming lowbies without any challange and they think they are good. They often que in 2+ premade groups. They never que solo but if tgey que they probably afking on their gv's and qq that devs need to fix some classes because they are op. Third ones are pve guy+few heals(i do this sometimes but best example of this group is Abbi and Starburzst with their 2+ pocket heals always.). This premades are funny just for PvE geared guys.
To conclude, premades on this server aren't funny if you are with them and are not funny if u play vs them.