Vesgar wrote:You're right about that one has to give up something to be exceptional in a field, just like he went for the Mage/Thief path, I went with the Fighter/Thief and was content with just UMD tricks, as I just hate to see my BAB/APR go really low... Things like Combat Insight or Expose Weakness are great, but I never liked the thought of waiting for the epic levels till I can actually realize my character's potential.
It's tempting to try to make a true Fighter/Mage/Thief character, but I still have no idea how would that thing look like in nwn2. Anything with rogue, wizard and arcane trickster levels in it is really just a Mage/Thief, even if you add some Eldritch Knight levels to it and then you would miss hips, so we went back to picking Assassin levels again, which makes it look like a Mage/Thief even more, but with a sub-optimal CL.

Not exactly. Let me walk you through my Fighter/Mage/Thief:
W6 to start while getting able learner and melee weapon proficiency with 2 of your first 3 feats (other one was weapon finesse, for me). Then Eldritch Knight to 13 while getting your skills in place to take Assassin. Assassin 3 at 16 qualifies you for AT. So at level 20 you look something like W6/EK7/A3/AT4. Your caster level is 20, but you only have level 8 spells...You can get level 9 spells at 21 by taking AT or EK level, but I am actually leaning towards being W6/EK7/A4/AT3 at 20 w/ CL 19 and taking my first 4 levels in epics as Assassin which will get me HiPS at 24, but CL will be 19 the whole time and will only have 8 level spells. You end up as W6/EK8/A8/AT8 (though switching out a level of Wizard for EK gains 2 HP if you really want to squeeze every last bit out of it) with a CL of 25 and BAB of 21. The BAB is fine because you have GMW, Greater Heroism and if needed can use wands for bless and aid, in addition to HiPS and getting your DEX up to 26 (30 with Cat's grace) and you have a long term (25 minutes or more) AB of 40, 42 if you use bless/aid. This is PLENTY for a HiPSter. The major issue is HiPS is how you land sneak attacks, but it is also a defense against dispels so some scouting and advance knowledge is needed to make sure you don't come out of HiPS to fight a mob while a caster hit's you with dispel.
Another build is Storm Munin's idea, which is R/W/EK/AT. This does not get HiPS, but can hit CL30, giving up a 5th attack by dropping BAB to 20. Or you can get BAB21 and CL29 by going R4/W6/AT10/EK10. You have to forego TWF if you want a reliable way to land sneak attacks via feint, but have room for one hander, making this idea very close to your own build, but with feint instead of HiPS. CL29 is not going to be easily dispelled except by breach/mords for which there is no reliable protection outside of counter spelling or being able to use HiPS. Finally, there is the idea posted by Invoker to go W7/AT10/EK10/Bodyguard 3 which gets extra speed to allow for a bit easier time breaking line of sight so you can hide again and get's CL30 and BAB21.
Each of these three builds would (IMO) qualify as a fighter/mage/thief as you will have some skill in handling traps and locks as well as stealth and enough points to have a decent mix of skills. Storm Munin gives up a bit of fighter (6 APR due to BAB20 and no TWF feats) and 1 sneak dice over my Assassin build, but is CL30 and due to rogue can disarm traps over DC20. The point is that you can build a F/M/T and you can even reach CL30... You could even get HiPS and reach CL27 or 28, but you become much more of a mage/thief or a fighter/mage, depending on if you take AT or EK as your 4th class (W/R/SD/X).
Probably just making you question your build more, but don't. Fighter/Thief is fine and F/R/A/WoD is a fine build choice. If you're enjoying it just continue doing so, that'd be my advice.