I thought Basso and Evans on the Zoncalan was great viewing. Evans hanging on for grim death for as long as possible. Basso was incredible that day. Typically gutsy ride by Evans. Even though Rodriguez, Contador and Gilbert are the most explosive I still like to watch riders grinding away. Evans on the Galibier on both stages in 2011 TDF was another good example. He may not have been at the front but his reaction saved the race for him and it was great viewing especially also with Schleck going for broke out in front. Valverde and Cunego are pretty explosive too. Cunego in TDS last year was great viewing alsoTimmy-loves-Rabo said:well you are right with each to thier own opinion.
I find the excitiment for specific stages or races ussually climaxes around the steepest climbs to be honest, if cn is to be measured anyway. Go figure. It's easier to associate attack with explosivness i suppose, as distance can be covered more quickly. But I don't think that makes it more impressive, and in the past I have found the attacks on steep terrain to leave a lasting impression.