
Roland Banks is certainly a fun investigator to play with. He is mainly Guardian class and secondarily a Seeker class which makes him versatile in the two main objective in the game, fighting and obtaining clues.
He has a nice ability that lets him find clues whenever he defeats an enemy which, though you might not always be able to activate it, due to there being a lack of clues in the location, can save you an action or two when you need to gather clues (and possibly even more resources when trying to gather clues in high shroud areas).
Stats
He has 9 health practically making him a tank when it comes to taking damage but his low sanity of 5 make him quite vulnerable to a lot of the monsters in the mythos. You will definitely need cards that can either heal horror like Smoking Pipe or cards that shield you from horror like Elder Sign Amulet.
Combat: His 4 combat stat complements his beat up enemies to get clues play style and with a decent weapon like a Machete or his signature weapon, Roland's .38 Special, he can hold his own against a lot of what the mythos has to offer.
Willpower: Willpower is mostly a defensive stat. 3 willpower though on Roland isn't amazing but it's decent. There are rarely encounter cards that require you to succeed on a willpower of 4 or higher.
Intellect: Likewise with willpower, 3 intellect isn't amazing but it's decent. Having cards like Magnifying Glass or Flashlight definitely makes him better at gathering clues, especially when there are no baddies around for him to trigger his ability.
Agility: Roland's worst stat is agility, which isn't really game breaking as his playstyle mainly revolves around him killing enemies to get clues and he is in a class that has a lot of decent weapons. But it severely limits his options though as there are some enemies that he's better of evading and others that he might not even be able to damage at all (I'm looking at you Spoiler for Path to Carcossa)
Signature Cards
Roland's .38 Special is reliable even if you can't proc the +3 to combat buff it still functions as a cheaper version of .45 Automatic but when you get that +3 combat is when the signature card really shines. Also cards like Extra Ammunition works well with this card but if you have Lightning Gun you might be better off saving it for Lightning Gun's limited ammunition.
Cover Up is definitely one of the harder signature weaknesses to workaround which requires you to get clues (which thankfully Roland is decent at). Alternatively, you can have your allies help you especially if there is a more specialized seeker in the team. Also, the price for failure is the equivalent of being defeated in Roland's worse stat (sanity).
Overall, Roland Banks is a versatile as a fighter and clue gatherer but players need to work around Roland's 5 sanity and signature weakness Cover Up.