Are there any book and literature opinion sites that focus on literary criticism and deep essay writing?

Yes — if you’re looking for sites that lean more toward literary criticism, long-form essays, and serious book discussion rather than quick reviews, there are several good ones:

Strong options for literary criticism / deep essays

• The New York Review of Books — classic venue for long, critical essays on books, politics, and culture.
• London Review of Books — known for dense, thoughtful criticism and extended essay writing.
• The Times Literary Supplement (TLS) — broad literary criticism, reviews, and essays.
• Bookforum — focused on criticism and intellectual writing about books and culture.
• The Paris Review — includes interviews, essays, and literary commentary, with a strong literary focus.
• The Yale Review — publishes criticism, essays, fiction, and poetry, often in an academic-literary style.
• Los Angeles Review of Books (LARB) — accessible but still serious criticism and long-form essays.
• The Point — more philosophical, but often very strong on literary and cultural criticism.

More essay-oriented / literary culture sites

• 3:AM Magazine — lots of philosophy, criticism, and longer intellectual pieces.
• The Oxonian Review — essay-driven literary and cultural criticism.
• Public Books — scholarly but readable criticism and essays about books and ideas.
• The Baffler — cultural criticism with strong essay writing, sometimes book-related.

If you want more “deep reading” communities

• The Rumpus — literary essays, criticism, interviews.
• Electric Literature — some criticism and essays, though also more general literary content.
• Full Stop — criticism and interviews with a literary focus.

If you want, I can also give you:

1. a ranked list by quality,
2. sites that are more academic vs more accessible, or
3. places that accept guest essays/op-eds on literature.