An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).

An adjective that might serve your purposes is partisan : ‘exhibiting blind, prejudiced, and unreasoning allegiance’. As you say, such a person’s commentary can actually be completely accurate as far as it goes, but still fiercely biased.

The same word also works as a noun : ‘a person who shows a biased, emotional allegiance’ (although as a noun it often indicates a combatant, not merely someone with a strong prejudice).