In my opinion, I've seen it and it looks cute. Yes, I know they don't really meet in game and the rare ones (I've only seen 2 which is suprising) I've seen of them together though is rare, so I haven't seen enough to judge it with harshisity, I don't think.
I'd give it an 8/10, as it does look cute. I haven't seen any bad things about it, but haven't seen enough to fully get it into the highest rates. It isn't my main Martlet ship, but it's still cute looking. ☆^v^☆
1) Both dress into cowboy-themed attire to feel braver/more important than they are
2) Clover, instead of a regular kid, wants to feel like a hero; Star, instead of a regular farmer, also wants to feel like a hero
In reality, Star is not the tough guy he pretends to be. His optimism, protectiveness and caring nature make him a hero though.
In reality, Clover started off as a scared kid who became more confident and skilled thanks to Flowey's resets. Their heroism comes from their forgiving and selfless nature and the hidden courage they got the chance to explore.
2) Both acted childish during a dangerous situation
Clover came down the mountain with a toy gun so that it would bring them comfort/they'd feel more in control of the situation (if you remember, Frisk refused to play with Asriel's toys in UT, saying how they're "too old," and I assume Frisk and Clover are the same age).
Starlo brought a fake gun before confronting Clover in genocide, just to feel cool.
3) Both not only value justice, but base it on compassion
Clover's entire mission was to bring justice (avenge the kids), but along the way changed that mindset (in pacifist). Star says how him and his posse aren't bandits, tests Clover's sense of justice and morality with the trolley problem, and wants to give Ceroba a second chance despite her actions.
4) Starlo's got protective fatherly instincts
5) fatherly pride
8) a lot of monsters associate Clover with the Dunes/Wild East
9) oh and... Starlo referred to the Wild East as Clover's.... home. Twice.
You can read it right here!: https://archiveofourown.org/works/54160936/chapters/138050503
Hopefully the wait wasn't too bad, took me a while to get everything done for this one, and the thing is Chapter 3's probably gonna take even MORE time... because big finale needs the special-est treatment