Okay, so here's my 2 cents, which is backed up by several wolf guardians. :3
1) Forget shields, nobody needs them. Even half my paladins didnt use shields.
2) Weapon: Get something two-handed with a half decent damage modifier on it. Assuming you are untwinked this is going to be a bit of a problem. Look at the vendor items, possibly gambling or putting the horadric cube to use. At level 20 you probably have that already, or will soon. There's also some guides on how to efficiently shop for items around, or used to be around, at least. Back in my day. :3
3) Feral rage is indeed quite okay until you get to fury, in fact, even once I get to fury, I still use feral rage all the time to add to my leech. I think I kept feral rage on the LMB and fury on the RMB, but it's been a while. In the long run you should try to not be too reliant on leech, though, because some things cannot be leeched and if you don't get into the potion chugging habit early on...
4) Don't pump strength or damage or dex for blocking, just get enough to use the items you want to use, put everything you can afford into vitality, which will be doubly useful because of the wereform bonus. (Also keep in mind that +life items will work with the %life bonus, +vit items will not). I admit that my werewolf could count on an upgraded ribcracker, which is not only extremely glorious, but also ridiculously light on the stat requirements. Usable from mid nightmare and easily good enough to carry to hell and beyond. But yea, there's lots of options for weapons around. Ideally I'd not use a collossus blade or something that needs about stat 300 points of investment, though.
5) One thing I'll say about the other tips: Forget crushing blow. Especially if you MP, and even more so if you increase the player setting beyond "players 2", as most people I know do. CB does not scale with player setting (unlike static field). With a half decent weapon you should kill most things quite quickly, definetly way before CB can become relevant. Plus, if you are untwinked CB will be hard to obtain anyway.
CB is cute against bosses, when/if you run them repeatedly in hell, but that's about the extent of it for a fury wolf. Heck, even against bosses it's barely useful with the absurd damage a fury wolf can dish out later on.
