Well certainly everyone is entitled to their tastes and 'druthers. But Wedge is a Wedge type and Han is a Han type already. Dash Rendar was a Han type who didn't go Jedi. He didn't get extensive development, and I remember some buzz about people NOT liking a Han type when we already have Han. Tycho is a Wedge type who was developed in a number of ways to also not be Wedge, and I can't think of anyone talking about disliking Tycho. So maybe we get sort of the archetype of a character type, Luke moral Jedi, Han smuggler rogue, Wedge straight up starfighter, and they are so popular that you want more like that, but at the same not someone so similar that it feels like a blatant copy.
What I'm getting at with my replies is that perhaps there is a need for similar but different, and while Corran may feel similar to Luke, he's also different. If a character is similar without much development they can feel like a rehash, but given enough development they can also be different.
So there was a similar Han and similar Wedge, and you say Corran is a similar Luke. Well, yes, he's a human with Father issues while young (Luke wishing to know his Father who's 'dead', Corran looking up to his Father who gets killed). He has a strong moral fiber and becomes a pilot in Rogue Squadron. Then he develops Force usage and becomes a Jedi Knight. In a simple review such as that he seems very similar. But we have stories of Corran with Corsec that are different from Luke's stories at a similar age. How Corran gets involved and his time with Rogue Squadron has him heavily involved with Ysanne Isard and the Lusankya and the search for the prisoners, as well as the world of Mirax and Booster. There's just so much development for his world that is quite a lot of activity different from Luke's experiences. He arrives at the Jedi Academy because of his desire to find Mirax, which takes him deep into Jedi commitment, but then he leaves that aspect to pursue his Corsec roots ultimately to find a balance between both aspects of his nature.
You may think he's just another Luke, and wish he were just another Wedge or Han type. But I think that he isn't just another Luke, he's similar true but also quite different, because he developed way beyond being another anybody else. He has his own character identified that if anything, there's a chance that somebody new could have been created to be another Corran type.
I happen to hold the whole X-Wing Rogue Squadron run of comics and novels, and all the one off novels or comics that tie in with the plots and characters in this subworld of Star Wars, to perhaps be the greatest subset within Star Wars after the original Anakin Luke Vader story line.
Whenever anyone would ask 'what to read' in the EU, one of the things I'd bring up was that there's this whole non big three subsection that is greatly developed with characters and locations and plots, and is a great example of how much can be created in the Star Wars universe without being retreads over the main themes.
So I guess what I'm talking about is that ole' 'certain point of view' perspective. Maybe trying to notice the areas where Corran isn't Luke can help you find a bit of a balance where it doesn't bug you as much. You may have forgotten things or never gotten to them to see the differences.
As for your Poe comment, I can't comment there because I do not follow Disney owned Star Wars content. No TV shows, no movies, no comics/novels. When the EU was halted and then erased or wiped out or however someone wants to argue what it should be called, the world of Star Wars stories became finite to me. I have been re-reading the EU in chronological order from the start since the sale and the story line decision, and been loving every minute of it. I want more of my 'Legends' story lines, and not one thing that I've read in discussions about the new movies and comics/novels has sounded the least bit interesting to me. Certainly not better than anything written in the EU that it is replacing. I am a huge SW fan who has not seen the movies even though people may not believe me, and I don't plan to in the foreseeable future.
Atari, NES, and a few games on Sega Genesis were my heyday for playing video games. So I have no SW video game knowledge and that's another area that I can't comment on, which is why I said above Kyle Katarn barely registers with me.