I don't know, the movie just didn't age well (unlike, say, A Few Good Men or Unforgiven, both of which also opened exactly two decades ago). For a multi-awarded drama, Ikaw Pa Lang Ang Minahal is cringeworthy and unintentionally hilarious. My whole experience was perfectly summed up by the twelve-year-old who watched with us and Spoiler! astutely remarked: "This is painful to watch."
I went on Google to find the film's exact title and encountered this nearly two-year-old article where the writer said that Maricel Soriano should've won an award for her "tour de force performance." I thought, Okay, that tour de force bit is a stretch but whatever, everyone's entitled to their own opinion, yadda-yadda-yadda.
I soon discovered that the same writer has commended everyone and their mothers, it seems, for "tour de force" performances (Jean Garcia, Anita Linda, Coco Martin, Eugene Domingo, and Gina Pareño) and portrayals (Rustica Carpio, Susan Roces, Judy Ann Santos, and Glaiza de Castro). Hell, even singing (Raymond Lauchengco)!
It looks like somebody found a nice, highfalutin phrase of French origin he could drop in articles as a fancy adjective (although it's not really an adjective). I wouldn't be surprised if the writer in fact describes everything—from overwrought, beat-you-over-the-head acting to his bowel movement in the mornings, and everything else in between—as "tour de force."
Like Iñigo Montoya I can only go, You keep using that word; I do not think it means what you think it means.