Critical thinking is not necessarily being "critical" and negative. Actually, a more precise term would be evaluative thinking. The result of evaluation can range from positive to negative, from acceptance to rejection or anything in-between. Yes, critical evaluation can produce a glowing recommendation.
Discussion
In productive problem solving you generate ideas (by creativity) and evaluate ideas (by criticality). Critical thinking literature reveals three different viewpoints. These vary so greatly that they constitute differing paradigms. The absolutist paradigm views critical thinking as a correct way of thinking to effectively seek out a correct answer ...