Regarding your first point, I think the majority of the PVP playerbase shares your displeasure with bolster. We're all unhappy about it. The best we can do is keep grinding Conqueror and hope bolster gets fixed, removed, whatever.
On your argument about class demographics, ranged DPS has become widely popular. You've played against some pretty lousy snipers/slingers (probably me) if you consider their DPS manageable. Lightning sorcs' talent tree has been brought to a level which is giving them some attention, and it's great to see. Mercs... no comment. Which server do you play on? Are you solo queing? Which bracket are you playing in?
Premades? Four friends should be able to play a game together. Groups of friends join games together in Battlefield games, RTS games like Starcraft, etc. I don't see the issue. Sometimes I solo que and get rocked by a team with a premade on it. Sometimes I que in a 4 man group and get beat by another team with a 4 man group. It's a computer game. You win some, you lose some. It's nice being carried by a 4 man premade though eh? Trust me, I get carried all the time.