Ok, first of all I don't go for area dispels too often, only If I'm fighting say 6+ guys. Since if I'm the monsters (because Im DMing) and I'm fighting the PCs, and theres only 4 PCs, Im always going to cast a targetted dispel.
Obviously there was some wonky stuff going on with reactive counterspell and haste. You make a case for ring of counterspells. You were 15th level yes? Ok, Greater Dispel is what should have been used against you. And I believe it wouldn't really be a "chance" of greater dispel not getting rid of almost all of your buffs.
While Divine Power on your next round is a good option, it doesn't nearly make up for what you just lost in terms of double empowered 2nd level spells. And I'm guessing with all of those slots (6th level slots, your highest) spent on double empowered buffs you went way down in any fighter's estimation, especially since he could probably just disarm or sunder your now crappy +1 weapon.
As others have said, until you post some real data this is just theory-d&d. Your 3 sets of boots of haste was extremely suspect by many (I understand you didn't wear all 3 at the same time, but swapped them out. However, if you look closely boots of speed is based off of haste, haste will no longer allow extra actions, neither will the boots).
As someone pointed out, you can't Dimension Door then cast a spell, as it says in the spell.
True Strike requires a round to cast, then a round to strike. Intelligent enemies (ones who realize what spell you just cast, a spellcraft DC of what, 11?) will get far enough away from you to prohibit being attacked, or ready an action to attack if you attack them and try to disarm you. Wasted True Strike.
Even with 10 dispel magics memorized, you were abusing Reactive counterspell or you werent attacking as much as you lead us to believe. Also, if I cast Greater Dispel and you cast Dispel Magic to stop me, well good luck. You get a d20+10 to beat a 26 (11 + spellcaster level, lets assume it was an average encounter, level 15 spellcasting opponent). So on a 16 or better, you counterspell, on a 15 or worse, you are debuffed for the rest of the day. If this happens in the first encounter for the day, you are pretty screwed.
You are abusing buff spells, not the mystic theurge. Your friend's Finger-o-Doom doesnt seem nearly as powerful. Spectral Hand + Death Knell? Allow me to point out that Death Knell is an evil spell. So I hope he wasnt the one planning on curing everyone after a fight, since by casting evil spells that proves he is evil, and therefore a negative energy user. If he was neutral, by casting death knell every fight for many adventures, lets say the DM should have wrote him a little note. And death knell doesnt stack with death knell, and it means you have to leave a "living" creature with hit points lower than 0. So -1 to -10, most monsters get obliterated, destroyed, or hacked to death, so it seems pretty convenient to cast this spell every fight on the monster that just happens to be alive by that much.
So, I think you abused the hell out of boots of speed and to a lesser extent buff spells. Not the theurge.
Technik
Obviously there was some wonky stuff going on with reactive counterspell and haste. You make a case for ring of counterspells. You were 15th level yes? Ok, Greater Dispel is what should have been used against you. And I believe it wouldn't really be a "chance" of greater dispel not getting rid of almost all of your buffs.
While Divine Power on your next round is a good option, it doesn't nearly make up for what you just lost in terms of double empowered 2nd level spells. And I'm guessing with all of those slots (6th level slots, your highest) spent on double empowered buffs you went way down in any fighter's estimation, especially since he could probably just disarm or sunder your now crappy +1 weapon.
As others have said, until you post some real data this is just theory-d&d. Your 3 sets of boots of haste was extremely suspect by many (I understand you didn't wear all 3 at the same time, but swapped them out. However, if you look closely boots of speed is based off of haste, haste will no longer allow extra actions, neither will the boots).
As someone pointed out, you can't Dimension Door then cast a spell, as it says in the spell.
True Strike requires a round to cast, then a round to strike. Intelligent enemies (ones who realize what spell you just cast, a spellcraft DC of what, 11?) will get far enough away from you to prohibit being attacked, or ready an action to attack if you attack them and try to disarm you. Wasted True Strike.
Even with 10 dispel magics memorized, you were abusing Reactive counterspell or you werent attacking as much as you lead us to believe. Also, if I cast Greater Dispel and you cast Dispel Magic to stop me, well good luck. You get a d20+10 to beat a 26 (11 + spellcaster level, lets assume it was an average encounter, level 15 spellcasting opponent). So on a 16 or better, you counterspell, on a 15 or worse, you are debuffed for the rest of the day. If this happens in the first encounter for the day, you are pretty screwed.
You are abusing buff spells, not the mystic theurge. Your friend's Finger-o-Doom doesnt seem nearly as powerful. Spectral Hand + Death Knell? Allow me to point out that Death Knell is an evil spell. So I hope he wasnt the one planning on curing everyone after a fight, since by casting evil spells that proves he is evil, and therefore a negative energy user. If he was neutral, by casting death knell every fight for many adventures, lets say the DM should have wrote him a little note. And death knell doesnt stack with death knell, and it means you have to leave a "living" creature with hit points lower than 0. So -1 to -10, most monsters get obliterated, destroyed, or hacked to death, so it seems pretty convenient to cast this spell every fight on the monster that just happens to be alive by that much.
So, I think you abused the hell out of boots of speed and to a lesser extent buff spells. Not the theurge.
Technik