I thought his relationship with Dick was really well-developed and great, as was his romance with Artemis, but to each their own. I at least appreciated getting to see Wally with his family outside of his costume over seeing him with Barry's job.
I think you could see how he matured and changed in what little we saw of him as season 2, where he came off more older and not the cocky hotshot he was in season 1. They just didn't get a chance to really expand on it.He was the same character at the end that he was at the beginning. The only change is he transferred his need to do the hero thing to make him feel better about himself onto his relationship with Artemis.