Well, nick does a great job at convincing the usefulness of the barb levels to maximize a bards dps. However, when I built my battle bard I refrained from touching barb; and instead settled on 4 full fighter levels because of the following:
Before replying im looking at specificaly ur ftr 4 vs ftr 2 barb 2 split And obviously onthing personal just thrashing out the nitty gritty.
1. When I'm running epics- I can't afford to have my source of dps and hp also inhibit my ability to either dance an opponent, heal a party member, ddoor, or buff. Sure I can always dismiss the rage, but that is 1 less rage I now have for whatever else I'll be dealing with later.
I think you are overstating the hp and combat dps ftr lvls 3-4 brings. Raging is awesome but compare an unraged 2 barb split vs ftr lvl 3+4 (Assuming the barb variant took 2 lvls of ftr also). U get
Fighters Favor
+6 hit points (costing 2ap - nothings for free!)
Haste Boost II (5% increase over the barb variant for under one minute only)
+1 to hit (Barb Power Attack cancels out Weapons specialisation for a 2 hander - my personal pref for epic running on a bard - I cant seem to get 2wf to high enough values to satisfy me. I quickly MyDDOd ur bard to see what you were playing with so I could make some comparisons. Looks like ur goign 2 handed also.)
Possible +1 to tactics (But without the Barb PL and Barb levels getting ur str up enough to make this viable is unlikey)
Barbs Favor unraged
10% Run speed
5 Sprint boosts
The reason I mention these is there is awesome synergy in high base run speed, Sprint boost, and fascinate. U can use that mobility to avoid attacks (if skulled) or get to where u need to FAST (like hauling ass to a failing base is EV6)
Conclusion
Ftr : +1 to hit, +6 hp, 5% alacrity for under one minute.
Barb : greater Manoueverability.
In my eyes that isnt a "source of hitpoints(6) and DPS" (+1 to hit and 5% alacrity for sub-one min).
Edit: When i saw ur 3 free ftr feats u listed as you used (impr crit PA and WF) it seems ur not taking WS? if you arnt taking WS the unrage barb is doing MORE dps than the 4 ftr split.
2. The barbarian levels don't allow the 3 class feats I used to acquire Improved critical, PA, and weapon focus in order to open up potential toughness feats for further hp pool expansion (when chopping away at the epic DQ for instance)
Firstly 2 barb/2 ftr vs 4 ftr only loses you one feat. Obviously u know this but maybe you were compararing 4 barb? If so no I couldnt recommend anything higher than 2 Barb + Barb PL and 2 ftr lvls for the 4 feat split. Funnily enough you're point on chopping away alludes to Boss fights where only DPS matters. This provides me a good place to launch the Raged Barb vs Ftr comparison.
So assuming similar base stats il do the following comparison (Im going to use WS instead of Toughness uif you dont mind for max dps). If you dont mind i'd like to include the Barb PL feat as that what pertains to my personal build plans - and I guess thats the point of this thread figuring out what split brings what benefits. Also I may as well tell you what my rages look like at a 2 lvl split with the Barb PL - 4 Rages (with FB tod set), lasting aorund 4 mins each giving +8 str/con.
Raged 2 Barb/2ftr vs 4 ftr split - DPS and HP standpoint.
Barb
+ 80hp (Rage)
+4 to hit + 6 (Damage)
-1 to hit +2 Damage (Barb PA)
5x +2 damage boosts for under one minute (situationally engageable good in dq)
+8 str to help vs knockdown ( I think im looking at around 50 str for a wf version giving you a reasonable save vs that knockdown).
One use of uncanny dodge (Minor)
Fighter
+6 hp from ftr tough II
+2 hp from the difference between Barb PL feat and regular tough feat.
+2 Damage WS
+5 % alacrity for under one minute ( I vs II)
Conclusion
Barb has a higher to hit (+3) does more damage a swing (+6 a swing) has more hp (72ish) and boosts will balance out - once u run out of haste boosts and then the barb variant uses dmg boosts.
3. Going full 4 fighter levels also unlocks the second tier haste boost, 20% is a great suplement to the feat distribution, not to mention the fighter str tiers and fighter toughness enhancements. Its an all round boost to dps and hp via feats and enhancements without compromising your spellcasting abilities.
Str tier is attained at lvl 2 the 2/2 split cna benefit from this just as much as the 4 split. Everything else was addressed above.
Two rogue levels are great, but my bards saves are sufficient to not have to rely on evasion to survive. Fighter 2-4 imo grant more than what rogue 1-2 give outside of evasion.
Completely agree with this. Reflex is a primary bard save getting a good score here is easy enough. I think rog synergises well for 2wf btu i dont like two weapon fighting for a bard at epic levels as the numbers and what u have to sacrifice in terms of stat allocation and feats doesnt add up.
Just my two cp. =D