Collocations for critical - adj.

be
become
remain

extremely, fairly, very, etc.
bitterly (esp. BrE), deeply, fiercely (esp. BrE), harshly, highly, severely, sharply, strongly
increasingly
overly
I think you're being overly critical.

equally
a little, slightly, etc.
mildly
openly
She became openly critical of party policy.

of
The report was highly critical of the company's poor safety record.

be
become

really
absolutely
increasingly

for
Maintaining control of the the budget is absolutely critical for success.

to
This reorganization is critical to the long-term future of the company.

Critical is used with these nouns:
acclaim, accolade, analysis, appraisal, article, assessment, attention, attitude, comment, commentary, component, condition, consciousness, consensus, consideration, controversy, crossroads, detachment, discussion, distance, distinction, edition, element, enquiry, esteem, evaluation, examination, exploration, eye, factor, faculty, feature, feedback, flaw, function, gaze, illness, importance, information, ingredient, insight, issue, judgement, letter, link, literacy, look, mass, milestone, moment, need, overview, part, period, phase, point, praise, reaction, reading, reappraisal, reception, reflection, regard, remark, report, review, role, scrutiny, shortage, situation, stage, stance, step, success, task, test, theory, thinker, thinking, thought, threshold, turning point, understanding, update, voice, vulnerability, work, writing