Starting a new game, would appreciate suggestions Options

[Mongerman]

Here I am, back for another round of punishment and self abuse. Anyway, my planned party (all created) is

Vagrant (flails as main weapon, axe or belm in offhand)
Sorcerer
Wizard (what would be a good specialist class for this character?)
Berserker (main tank, using shield with longsword/1 handed crushing weapon. All AC boosting items go to him)
Ranger/cleric
Cleric

Question, is the pureclass cleric really necessary? I choose her in anticipation of all the healing I'm going to need, but it would be great if I could throw in some melee capabilities as well.

2nd, I've been browsing the threads, and I notice the once popular f/m multi class does not have a place in many parties. What happened? Are they nerfed or something?

TIA for feedback!

[Shadan]

About halberds: if you max. out 2handers with 1 fighter, you can always switch to 2handed sword or Staff of the Ram, when enemy immune to piercing. But there are enemies which immune to slashing for example, and most vulnerable to piercing. I think piercing resist is decreased in latest versions of IA. But halberds are important because they can make you immune to the 2 mostly used high level AE spells: Abi Dalzim and Dragon Breath... It is a lifesaver if your dispelled fighter can be protected against these spells. And Dragon Breath's has very good damage also. What else, you can get good halberds in all stage of the game. And my last comments: as a fighter it is much easier to max. out 5* in halberds, 2hander style, and 2handed sowrds, and still you left some points in staves. If you want to use dual wield, that is more weapon skills, 1 more point in dual wield, and you probably want to use different weapon types in the 2 hands because there are not 2 good high end weapon from 1 type. For example JD sword+Axe, or JD sword+Hammer of Thor etc. And if you calculate damage types also, to be ensure your character can do at least 2 damage types from the 3, and you calculate with weapon choice of other characters in your party, then I think it is much harder to max. out a dual wielder fighter than a 2hander one.