As to what concerns the most deadly builts out...

[WarBlade]

While the Bow using Amazon has argueably the most potential to be "abused" as a cooky cutter, this is only true for those playing within a very limited area of the game using only a limited number of approaches.

The approaches I limited myself to was in making a total of two trades on that character and her skills were Valkyrie (Maxed) Magic Arrow (1 pt primary attack) and Freezing Arrow (Maxed alternate attack - Mana allowing) and high level Pierce.

The "very limited area of the game", as you put it, turned out to be from about cLvl 40 onwards. In other words, all of Nightmare and Hell.

Weak part: many areas in the game do not favour amazons (mainly tight ones with lots of corners) single, strong, hard hitting monsters can be easy and quick death to (unskilled) amazons

I count two problem areas. Hell Travincal gave me cause for caution and Hell Diablo himself was handing me my arse until I remembered ShadowHM's stash was packing a Rising Sun she was trying to trade away.

What most people forget is that it actualy takes skill to finish the full game.

Not with a bow on an Amazon it didn't. "Skill" equated to standing somewhere and blazing away until all immediate threats were disposed of, plus a few non-immediate threats more than a screen away. That's not skill. That's boredom.

BTW I was using Goldstrike from Act 5 Nightmare onwards and Cast on Attack wasn't (isn't) working for Open.

(In contrast to getting "rushed" past any possibly difficult part to get to Hell Cowgames where even an unskilled player can wreak havoc easily)  So before putting the Bow using Amazon in the "boring" category, take an above average equiped "Bowazon" just do the quests...
Multishot one trick ponys won't cut it! A multi-skill (Strafe, Freezing Arrow, Immolation, Guided Arrow, Decoy, Slow Missile and yes, in some situations even the "Cookie-Cutter-Signature-Skill" Multishot)

Judging the fun of a whole class by the ease of clearing the foothills and the cow level with one skill sounds a lot like a predjudice to me.

I was playing mostly solo in "Players 8" (as in no rushing possible). I did one cow run. I don't run the Foothills. My judgment of the class is by her performance throughout the game and not restricted to the areas you suggest.

Basically I came to the realization that the relationship between Pierce and Some of the Amazon's upper level ranged attacks left a class that was outright pointless to play. It was like running through the game with a "God Mode" enabled. <_< And until Pierce and Valkyrie's get nerfed, my opinion will be unlikely to change.

She's sleep-inducingly boring. <_<