Am I the only one who thinks it's still the best or maybe second best US commander? Would love to hear top player's opinions on this but the top 200 popularity ranking is definitely not representative of its strength.
At best I'm a high 200s 1v1 player (for what it's worth). I don't think Mechanized is bad per se' its more a collection of underrated units and abilities that allow you to do different and interesting things but nothing really wows. For me Calvary Rifles are the highlight of the doctrine for their earlier timing, utility of smoke (criminally forgotten about), and being a rare elite(ish) unit with a snare. M3 lets you do some cheeky things and Mortar HT gives you more early game indirect options (and I've always liked the Vet 0 WP even if it's not super strong). I think Combined Arms can swing pivotal engagements (hello Jackson reload bonus) but it's not a flashy munitions dump.
Where is falls out for me is that when you consider it for your loadout other Commanders just start to look more attractive. Rangers and Paras have a higher ceiling and elite bazookas make up for no snares/can have more impact. New Easy 8 has several perks over the 76MM. Calliope is the Calliope. Most Commanders have better offmaps or munitions dumps. At the end of the day I think Mechanized is good-ish but more in a pre-planned strategy role where you're not crutching on a strong doctrinal late game.