I kept my Monk with who I had cleared BG1/SoD about 2 years ago as main character for my party into BG2 but finally decided to go with a party instead of trying to solo it. I made 4 other members (picking up a few of the NPCs one at a time to do some of their quests and I intend on picking up Keldorn as my 6th).
So my Monk started with his lvl 10 (500k xp) and stat bonuses from the BG1 tomes while my other 4 (Shaman, Wizard Slayer, F/T, Archer) started at the usual lvl 7.
I could have entered chapter 2 (only did Nalia and Airie quests) but I wanted to buy a few more items first. I'm finishing the 1st level of Watcher's Keep because I wanted the bottles and ammo containers and my Archer is now close to lvl 9 (I think I get an other weapon proficiency point at lvl 9 if it's like the Fighter).
I never really played rangers in any of my BG1/SoD/BG2/IWD so I normally only used Shortbows (on my thieves) and longbows on very rare occasions on my fighters (either to pull or some weird fights where they would be better not to charge in).
I was dumb and instead of looking up the potential archer weapons, I assumed Longbows (composite) would be the best ones for damage and that Shortbows were more for thieves. I was right about the non-magical ones. So when I made my archer, I put 4 points into Longbows (couldn't put the 5th, I think you get it at lvl 9) and the other point I placed into longswords although I don't really plan on ever meleeing with her.
I started having trouble damaging some monsters already in Nalia's Keep (especially the golem that requires +3 magic weapon) even though I was trying to use magic arrows (+1, +2 and the other types). Looking up info on how monsters that can only be hit by a certain +X weapon damage, I learned that the bows +X are irrelevant and only the arrows count. Learned that there are only a handful of +2 arrows in SoA and that it only gets worse as you reach ToB where archers have trouble being able to damage a lot of the enemies. I read that the best bow for this reason is the Genseng one (used with no arrows) as it counts as a +3 (I think?) and enemies are more rarely resistant to lightning damage than piercing. I read that otherwise, you kind of have to buy the +5 sling that acts the same way.
I don't really feel like starting my archer over (and I don't think I could import a new one in a current game if I'm not mistaken on top of losing 2 lvls) but reading about how she'll quickly become a dead weight (on top of my F/T that won't be able to backstab a lot of the enemies in ToB apparently) is bothering me a bit.
Am I basically doomed with her for late game BG2/ToB/Watcher's Keep because I put 4 points into Longbow? Is it still salvageable (I think that if she gets 1 weapon point every 3 levels, that means that based off the levels my characters had at the end of ToB in my last playthrough, she might only reach 4 points into shortbow near the end of ToB which wouldn't be great). Should I still get the 5th point into longbow (currently have Elven Court +3, I read Heartseeker isn't too bad but slightly worse) or try to max out Shortbow right away? Would I have needed points into Slings to use the +5 sling when I don't have arrows that are good enough to hit the stronger monsters/bosses?
Worst case scenario, I guess I'll replace her with one of the NPCs but I kind of liked the Archer so far.