Landeril: I am playing a human fighter, Already level 6 or 7, with 15/16/16/10/10/10 in stats. Thats Str/Dex/Con/Wis/Int/Cha. I took Military as a background I believe and my companions imo already suck.
The militia background is pretty bad. It's effectively just a difficulty-increase with some roleplay fluff tacked on. I don't know what the developers were thinking with this one; the penalty is nasty and the benefits are close to useless. Your strength score is also quite low for a single-class fighter. Neither of these make your character unplayable, but they will affect you.
Landeril: I have the Dwarf Fighter who wants to be a monk, the Tiefling Rogue(I like her) and the Druid.....The Healer don't heal worth anything, the fighters barely hit and the rogue >> Dies
Clerics and Druids are more "Red Mage" than "White Mage" and if you're treating them as dedicated healers then you're only using a tiny fraction of their power. Both of these classes are offensive power-houses with their mix of support spellcasting and combat ability. Try having Elanee summon her animal companion, cast a summoning spell for another supporter, cast some more spells to buff the party, and then shapeshift into a nasty beast. If you're willing to rest frequently to recover spell slots, Elanee can solo much of the game.
For Khelgar, have him turn off combat mode usage. He's probably using power attack, which trades accuracy for damage. This can be very powerful if you use it correctly, but you only want to use it when he's got magical buffs on. Go to the AI behavior and turn off combat mode usage so he uses his regular attack accuracy. For both fighters, I'd recommend going with a two-handed weapon (or just unequip their shields and they'll automatically wield their one-handed weapon in two hands). Single-class fighters have
loads of hit points, and both of them have high constitution scores, so they're really the last party members that actually need the AC boost of a shield.
For Neeshka, yes she's fragile. Keep her out of reach of enemies, and run her away if they focus on her. If they ignore her, then have her try to flank for an easy sneak attack. If they follow her, then have her run away and let the rest of the party take free pot-shots at the enemies who pursue her. This is another reason why you want your fighters to be wielding two-handed weapons. If they're just trading blows with enemies then trading offense for defense is a toss-up, but if enemies are attacking their allies you want your fighters to be able to go all-out offense. Neeshka is also quite good with bows, so give her those.