That's a fair point Vash. Gonna make a comparison between Golden Time and Toradora, so spoilers for both.
With Toradora, Taiga and Ryuuji were similarly telegraphed. I could totally believe that a relationship between Ryuuji and Minorin would work just as well, but I thought Taiga and Ryuuji's relationship was so genuine that the way events played out were natural and fitting. As a result, I was totally fine with the way Toradora ended.
With Golden Time, it's kind of different. I find Koko absolutely captivating as a character, even though I can't say that I like her personality. In that respect, I can absolutely understand why Banri felt an attraction there. I totally admire his actions in episode 6 when he forced the issue with Koko to move things forward. What I didn't buy at the time, and still don't, is Koko reciprocating and agreeing to enter a relationship.
It's an interesting angle for a series to take, looking at a relationship that doesn't feel right from the beginning. A very different approach to Toradora. While I like Linda a lot, I'm not opposed to the Banri/Koko pairing in principle. What I'm worried about is the series ending by presenting the current Koko and Banri relationship, with all the neediness and emotional blackmail, as healthy. The longer it goes on like this, the more I worry. That's what keeps me watching every week though, so they're doing something right!