Heya, this is kinda hard question, but i do my best and hopefully hit some of the things you want to hear
Healer changes made zealot near impossible to fight against with most of my toons. The dmg outout combined with sustain of double detaunt just means that you would need to have 20kish burst to get it down before you die. Ofc this is in perspective of dps specs. RP seems to be more manageable, ofc i fight them with BiS magus which is far stronger than most other solo characters i have.
Pet classes are now nastier than ever, as you cannot avoid the pets really. You either detaunt or try to kill them fast.
Against WL you can spec in high parry and riposte kills the lion for you. Against SH you just try to catch the gobbo and maybe kill the spiked squig to remove the AA.
Snb tank cancer seems to be fading. Still some around but not that many.
There also is a huge difference on which side you play. Order mostly soloes with am/wh/wl with occasional wp and then there are the wh groups, and am/sw kitegroups chasing destro soloers around.
If you play order you have tons of shaman/squig groups, and WE parties ganking you, but you get to fight against more different classes.
All in all if you like to solo i highly recommend having lots of toons on both sides and just play whatever fits in the lakes at that moment.