You're right. The proposals you're making kill the class.
A 1/1 Fighter/wizard progression would get the following
d7 effective hit dice--you give d6
3/4 BAB--you think this is generous and propose a 2/3 BAB
The full wizard spell list (including scroll and wand access)--here that's reduced mainly to buffs
9 bonus feats (6 fighter, 3 wizard)--this one gets 6 and you think that's too many.
Weapon specialization--the arcane warrior doesn't
A familiar--the arcane warrior doesn't
The option to specialize in a school of magic--the arcane warrior doesn't
Heavy Armor proficiency--the arcane warrior doesn't
The flexibility have the multiclass not be 1/1--the arcane warrior doesn't.
The fighter/wizard actually gets more spells per day because of the ability to specialize in a school--and even a specialist has a larger spell list than the Arcane Warrior.
The arcane warrior gets three things the fighter/wizard doesn't:
Spontaneous casting (with low number of spells known, this isn't too much of an advantage)
Ignore arcane spell failure--this is a big advantage but probably not worth taking the class if it's powered down any further.
Access to 6th level spells (of course the fighter/wizard gets this if he multiclasses intelligently).
The argument that a 10/10 multiclass should be as powerful as a single classed 20th level character has a certain attraction to it but any reasonable analysis of a character's capabilities will demonstrate that this is not true. A 20th level character is not necessarily equal to any other 20th level character. To demonstrate the absurdity of the principle involved, consider a cleric 2/druid 2/bard 2/rogue 2/wizard 6/sorceror 6. Is such a character the equal of a 20th level wizard? Personally, I suspect that such a character isn't even the equal of a 9th level wizard in power.
Although not as extreme, 1/1 multiclassing with wizard is a sure way for any class to neuter its usefulness. Fighter/wizard is a particularly difficult multiclass to pull off since the fighter's combat abilities depend upon hit points, attack bonus, and feats and wizard progression neuters all three of those. Fighter x/Wizard or sorceror 1 or 2 is a fairly common multiclass because it gives a little flexibility (and a toad familiar and the shield spell) to the fighter. Wizard x/Fighter 1 or 2 is also occasionally chosen since the extra feats and hit points can make a difference for a low level character or a specific concept. The 1/1 progression sacrifices much more fighting ability than the fighter x/wizard 1 or 2 but doesn't get nearly enough spellpower to match the fighter 1 or 2/wizard x multiclass.
Even more significantly, characters need to be compared in the environment they will most likely find themselves--the environment of a party. While Fighter 1 or 2/wizard x has much to commend itself as a solo class or a member of a duo, the lack of a single classed wizard's high level firepower or a single classed fighter's hitting power means that it is much less effective in a party. The 1/1 fighter/wizard progression may possibly be favorably compared to the single classed fighter for a solo or duo environment but lacks the both the spellpower and the hitting power to be effective in either a front line or a spellcasting role in a balanced party. (To make matters worse, even the few buffs the 1/1 progression fighter/wizard would get by benefit of his multiclassing are probably available to the single classed fighter anyway through the party's cleric and wizard so the only things he has over the single classed fighter are redundant).
Therefore, it's my considered opinion that any arcane warrior class needs to be better than a 1/1 fighter/wizard progression. Otherwise, it will be too weak.
creamsteak said:
Is its HD reduced?
Is its caster level reduced?
Is its BAB reduced?
Is its spell list reduced?
Is its spells per day reduced?
Basically, I think a d6, caster level goes up normally, 3/4 BAB, short spell list (you've got that right?), and less spells per day are all pre-requisites to doing this. Also, reducing bonus feats to something slower than the psi-war wouldn't be a bad idea.
You might think this kills the class... but:
HP for Ftr = 5
HP for Wiz = 2
HP should = 3 (always round down)
BAB Ftr = 1
BAB Wiz = 1/2
BAB should = 3/4 or 2/3
Shortened list (because its spontaneous first of all, second of all because this character is going to gain full caster level, so he should have less spells per day than a sorcerer would).
Reducing the bonus feats because 1: I think this character should have a broad selection of bonus feats that includes meta-magic, and 2: this character should have access to variants of the psionic feats that use arcane energy instead.