Regarding Pony:
I am fine with the pet aoe damage.
I am fine with the reuse time of the pets aoe damage / stun.
I am fine with it being able to attack people 2500+ range away.
I am not fine with the reuse time on re-summoning it. This is the problem, if the pony had a 5 minute reuse it would justify the pets raw power and capability. As it is right now the summoner does not need to even use their heal/recharge class skills which were designed to keep the pet alive. It is more effective to just resummon the pet when it gets hurt/oom/CC'd because there is virtually no cooldown.
Fix the reuse to a fixed non modifiable 5 minute cooldown, make it viable to kill the pet and force the summoner to use another pet or retreat. This will fix pvp/siege/oly and force the summoner to be more tactical about how they play their class instead of using it to basically lob pony bombs non stop.