Just for fun, here's the comment count on each Mentor Monday. Briefly glancing over them, it doesn't seem like any one area gets vastly more top-level replies, just that some of the most-commented weeks have one or two really active threads:
Chronological Order: 1/6 -- Year-in-Review -- 29 1/13 -- New Set Releases -- 11 1/20 -- Judge Meet-ups -- 24 1/27 -- Born of the Gods Release Notes -- 24 2/3 -- Prereleases -- 25 2/10 -- Born of the Gods Policy/Rules Interactions -- 13 2/17 -- Event Emergencies -- 46 2/24 -- Modern -- 17 3/3 -- Mentorship -- 7 3/10 -- Reviews -- 7 3/17 -- Attitude and Maturity -- 9 3/24 -- What formats do you like to play? -- 33 3/31 -- Effective Communication with Other Judges -- 26 4/7 -- Subreddit Improvements -- 20 4/14 -- Staying in Touch with your Community -- 14 4/21 -- Journey into Nyx Prerelease Plans -- 16 4/28 -- Journey into Nyx Prerelease Stories -- 27 5/5 -- Reviews -- 18 5/12 -- PTQ's -- 18 5/19 -- No Topic -- 13 5/26 -- New Electronic Device Policy -- 15 6/2 -- Modern -- 14 6/9 -- It's a Conspiracy! -- 13 6/16 -- Judge Levels -- 27 6/23 -- Scorekeeping -- 32 6/30 -- Magic 2015 Prerelease -- 36 7/7 -- Magic 2015 Release Notes -- 22 7/14 -- Magic 2015 Prerelease Stories & L2 Re-Definition -- 23 7/21 -- No Topic -- 17 7/28 -- Deck Checks -- 27 8/4 -- Head Judging Competitive REL Events -- 11 8/11 -- Team Leading -- 16 8/18 -- No Topic -- 9 8/25 -- What would you like to know more about? -- 12 9/1 -- Spoiler Season (Khans of Tarkir Edition) -- 9 9/8 -- Unsporting Conduct -- 14 9/15 -- L2 Re-Redefinition -- 29 9/22 -- Khans of Tarkir Prerelease Stories and Cards -- 39 9/29 -- Slow Play -- 29 10/5 -- Khans of Tarkir IPG & JAR Changes -- 18 10/12 -- Regional PTQ's -- 17 10/20 -- Stalling -- 22 10/27 -- Ongoing Investigations -- 8 11/3 -- No Topic -- 19 11/10 -- Initiative -- 3 11/17 -- Creating Welcoming Environments -- 5 11/24 -- Scorekeeping -- 17 12/1 -- Respect -- 15 12/8 -- Judge Conferences -- 15 12/15 -- Avoiding Burnout -- 6 12/22 -- Happy Holidays! -- 16
By comment count: 2/17 -- Event Emergencies -- 46 9/22 -- Khans of Tarkir Prerelease Stories and Cards -- 39 6/30 -- Magic 2015 Prerelease -- 36 3/24 -- What formats do you like to play? -- 33 6/23 -- Scorekeeping -- 32 1/6 -- Year-in-Review -- 29 9/15 -- L2 Re-Redefinition -- 29 9/29 -- Slow Play -- 29 4/28 -- Journey into Nyx Prerelease Stories -- 27 6/16 -- Judge Levels -- 27 7/28 -- Deck Checks -- 27 3/31 -- Effective Communication with Other Judges -- 26 2/3 -- Prereleases -- 25 1/20 -- Judge Meet-ups -- 24 1/27 -- Born of the Gods Release Notes -- 24 7/14 -- Magic 2015 Prerelease Stories & L2 Re-Definition -- 23 7/7 -- Magic 2015 Release Notes -- 22 10/20 -- Stalling -- 22 4/7 -- Subreddit Improvements -- 20 11/3 -- No Topic -- 19 5/5 -- Reviews -- 18 5/12 -- PTQ's -- 18 10/5 -- Khans of Tarkir IPG & JAR Changes -- 18 2/24 -- Modern -- 17 7/21 -- No Topic -- 17 10/12 -- Regional PTQ's -- 17 11/24 -- Scorekeeping -- 17 4/21 -- Journey into Nyx Prerelease Plans -- 16 8/11 -- Team Leading -- 16 12/22 -- Happy Holidays! -- 16 5/26 -- New Electronic Device Policy -- 15 12/1 -- Respect -- 15 12/8 -- Judge Conferences -- 15 4/14 -- Staying in Touch with your Community -- 14 6/2 -- Modern -- 14 9/8 -- Unsporting Conduct -- 14 2/10 -- Born of the Gods Policy/Rules Interactions -- 13 5/19 -- No Topic -- 13 6/9 -- It's a Conspiracy! -- 13 8/25 -- What would you like to know more about? -- 12 1/13 -- New Set Releases -- 11 8/4 -- Head Judging Competitive REL Events -- 11 3/17 -- Attitude and Maturity -- 9 8/18 -- No Topic -- 9 9/1 -- Spoiler Season (Khans of Tarkir Edition) -- 9 10/27 -- Ongoing Investigations -- 8 3/3 -- Mentorship -- 7 3/10 -- Reviews -- 7 12/15 -- Avoiding Burnout -- 6 11/17 -- Creating Welcoming Environments -- 5 11/10 -- Initiative -- 3