Logan Hastings is incredible.
I am talking particularly in Current but I assume this would also be true in Legacy. I actually do own and have played everything but I am testing Chapter 2 Only for a while just to experience all the new stuff.
Starting with some anecdotal evidence.
I am playing Tommy Muldoon (Ch 2) through Carcosa and going through the first 4 scenarios, I have always been able to pay 5 resources for Loose Cannon and still have resources remaining.
I also am doing a campaign where someone else is the main fighter using Daniela. She ended up with a large pile of resources and not enough things to spend it on, and was wishing she brought Endurance so she could actually use the resources she had.
Historically, Guardians have struggled a lot with being able to afford all their stuff. Logan goes a long way to solving that, if you draw him early. Of course, Logan is sort of like a Guardian variation of Taboo Milan so I would expect him to be already good based on just that. Trying it out has surpassed my expectations.
Let's say your Guardian has Logan action 1 turn 1. The scenario is 14 rounds and he defeats an enemy during 50% of the rounds (perhaps a tame estimate in a 4 player game). In this example, Logan gave you a passive stat boost to your most important stat, a bit of health and sanity soak, and a net gain of 3 resources. That's wild value.
If you are able as well to pick off small health enemies like Rats, Whippoorwills, Zealots, Acolytes, etc., then Logan helps you even more by improving your basic fight so you can conserve weapon uses. Helping you with odd health enemies can save you ammo and protect against failed basic fight actions. This all translates to preserving your fighter's money in the long run.
For Tommy particularly, an opening hand Emergency Cache, Logan, and M1911 can translate to Logan & a firearm in play, with 2 extra ammo on it. That's an incredible start with Logan helping you generate more resources in the future and the extra ammo prolonging how long you can go until you must have another gun.
All in all, I think Logan (and also Bounty) can actually help a lot to change the narrative of the poor Guardian that can't afford to play their big cards. Yes Guardian economy can still be a challenge because what happens if you don't get the early Logan plus early weapon? You should still be mindful of affording your deck. But I've rarely had this many resources with this much consistency for a Guardian fighter. It's been pretty cool to see how big a difference Logan makes in practice.