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As for pets being unbalanced, I wish I had a tamer perspective of my own from the old days to compare it to....
I do have that perspective and it is NOT tainted by the evolution of pets.
I left UO about 8 months after Trammel Went Live.
I returned just before Greater Dragons were introduced.
For those that do not know what Taming was like when I left, then a short picture.
There was no Line of Site to taming a mob. There were no Lore Screens as you know them now. The only information given was introduced shortly before I left and that was a line of text saying your White Wyrm has gained a point in skill in ... or can not gain anymore (GM).
There were no limits number of pets you could have in the stable, there were no limits on how many pets you could have with you,
pets new permanent death,
pets could be transferred to players that could not tame or control them ... to within reason so no you could not transfer a Nightmare to a 0 taming person but you could transfer to someone with -20 to -25 of the to tame skill required. Yes that person needed to carry a lot of meat with them, as it was a constant feeding thing,
there was Power Hour, you took your tamer, you went and tamed skill appropriate stuff, you gained in skill. At the end of the hour you went and played UO. You didnt need to wait through 200 days of GGS to go from 100.0 to 120.0
People might want to whine about the tamer with 10 pets but I think anyone that has ever had 5 pets out as a pack understand group pets present a problem and the more there are the more the problem is.
White Wyrms and Dragons and Nightmare were something to be feared. Even for the venerable Tank Mage these things could 1 hit kill you. As an example for the White Wyrm it was common to put a stack of gold on the ground with a box on top of that. That prevented the WW from getting into the ledge you could teleport to.
People would line up there and take turns taming the WW's in relative safety, Oh did I mention that as long as you did not damage the Mob it would not cast on you?. Now when some jerk axed the box, that WW could kill everyone that wasn't paying attention to events in short order, meaning if you saw that happened you had seconds to decide to teleport off the ledge.
The Dragons and White Wyrms I came back to were cream puffs, in terms of to be feared, dressed in just basic crap armor. The Nightmares were even more of a cream puff.
In my opinion all the old Pets are garbage (yes a bit harsh but ...) and the newer stuff Bake Kitsunes, Rune Beetles, Hiryu, Cu Sidhe and certainly the Greater Dragon are puting the Tamer closer to were it was when I left.
The Greater Dragon went a long ways towards correcting this travesty and in no way is over powering. Consider a Group of PKR's vs a Tamer with a single Greater Dragon. If that GROUP (2+ people) can not beat that tamer then they sure as heck do not deserve to win.