So I've been lurking around looking at some older thread a somthing that has surpried me is the fandom for renarin and the predictions they have for him. These are the thing i remember him doing.
The chasmfiend hunt. Lets set the stage. Three people with shardblades and plate are fighting a giant monster two of them would be dead with out there plate a whole team of trained spearmen have just been destroyed. (a spear is a much better weapon then a sword in most cases) This is where Renarin comes riding in with no armour no training and just a sword. What does he think he's going to do. Some call this brave I think it is foolish, impulsive, and selfish.
Why is he selfish because he doesn't think of the danger he would be putting his family in by making them watch out. For him while he tries to prove himself. It's impulsive because he runs in without thinking of what he'll do or the consequences and foolish because he can't do anything useful there anyways.
2. The plateau run
Adolin leads renarin and some men to assist one of the high princes on a plateau run. When they get there Adolin sees that the men there are struggling. So he goes off to help their shardbearer push the parshendi back saving countless lives and winning the day if not the gemheart. Unfortunately we're not here to talk about how great Adolin is but to talk about whu renairin is not. So while Adolin is saving lives renairin sees some beleaguered men and run over to help once there he freezes and has to be brought back to safety. Think of the relief those soldiers must have felt when a shardbearer showed up and imagine there surprise when he does nothing but run away that would probably kick there feet out from under them. I'd be surprised if a bunch of them didn't let their guard down for a minute when he showed up and then got killed for it. Another disastrous move made because he had a second of bravery but nothing to back it up with.
3. The duel
Renairin's shining moment in my opinion. The problem is that he falls flat here as well. Lets look at his situation. He has no plate for protection, hardly training with a blade he can't even stomach holding. What does he expect to accomplish. Not much hopefully because that's what he does. By the time he get into the arena Adolin's back is to the wall. Leaving room for only three angles of attack front, right, and left so one of the four whoud be in reserve anyway. Renarin distracts this guy for all of thirty seconds with a couple clumsy parries before falling to his knees. he is then used against Adolin.
What he should have done is given the blade to someone competent Dalinar, a bridgeman, a squire, a chamber maid, or a wet paper bag. I would vote Dalinar. Between him Kalidin and Adolin they would have quickly wiped the floor with the four.
4.The end game
Lets do a compare and contrast here.
Shallan: has to find the oathgate and figure out how it works on a tight schedule in order to save countless lives. While people question her (the old lady pattern makes fun of ) and babble incoherently (renarin) plus other distractions.
Dalinar: Generals the army. Leads a rescue mission to save a group of soldiers. Take a wound fights with a psychopathic super powered assassin and more like dealing with the other highprincess.
Kalidin: drags a drunk, bleeding, nearly unconscious king away from a assassination plot while dealing with a bleeding, messed up leg and depression brought by the weeping. Then he is betrayed by his his best(second best?) friend takes a shard powered punch to the chest and keeps on trying to help the king. Even though he knows there's no hope.
Adolin: leads an attack of a plateau. loses his horse. (is there a special bond between the god horses and their rider) Remembers the conversation with Shallan and comes up with the plan to cut through the building basically wining his plateau. Then he fight a stormform shardbearer who must be much stronger more agile and have better endurance then warform who are still better then humans. Then he runs into szeth fets gis chull kicked then takes his armour off so he can keep fighting.
That's not even mentioning the common men who are fighting a super strong and fast monster who can throw lighting. Or roinin the cowardly high prince who attempts to fight the assassin.
Renarin: Whines , incites panic, and distracts Shallen who is trying to figure out how the oathgate works.
Compare renarin to the rest of them. He gives up while the rest of them keep fighting, keep trying and refuse to accept defeat. While he babbles incoherently.
conclusion
I don't know why renarin has fans. I don't know why people think he' going to be a great warrior or why they ship him with Shallan or Kalidin. I don't know why they think he'll accomplish anything of note when he has proven time and again that he will fail that he doesn't have what it takes to deal with the pressure or the stress of being important