Umm I would have to disagree with:
The Invinicble Ship Glitch - Ships can be easily sunk and levelled up without this glitch solo once you get Lighting. By removing the Masts on the ship then switching to normal cannonballs you can reduce the ship to two-thirds health, then take the wheel and finish him off with normal broadsides for up to 200REP. I always worried about this glitch becaue it was making players weak in the cannon department lately - ok, fun for a bit to do other glitches (like the walk off ship and explore other NPC ships) but more hassles (SvS attacks) so I never did use or miss this glitch.
SvS Repari Glitch - do ya cheat much? No one should be cheating in SvS and this glitch was just wrong. Now if they would just fix a few more bumps in the road I'll be headed back to SvS and the glory days
PvP - already a buggy forum where many wont play - if they actually get this fixed enough maybe more people would play...
In fact, I notice mose of your list is about being able to glitch against other players... and not the glitches we are really concenred about... so meh.