Why was the army of the dead at Minas Tirith?

[Beregond]

That's right - the Battle of Helm's Deep was more real and down to earth (organic, I like that). Man vs. Orc (plus Gimli and Legolas). Even the Elves who were spirited into the movie didn't upset the balance too badly. It was a fight to the death free of supernatural influence; yes, the Huorns came, but it was the Men as sent the Orcs into the Huorn Wood.

Sure, there was some silliness and over-the-top special effects, but most importantly the climax was retained: the Horn of Helm Hammerhand sounding in the Deep, and the riding out of the Rohirrim.

I'd bet if Gallup Research polled 1000 average movie goers they would find more people preferred the ending of The Two Towers over the conclusion to the Battle of the Pelennor.