I love him. I want him to return. D:
Seriously, though, Hiroshi, in my opinion was a great character. Sure, to others he might be a Satoshi clone, but he is quite different from the other boy.
For one thing, he's smarter. He actually did research in his quest to spot Lugia. That is different from the route that Satoshi took, who was really "in the right place at the right time."
The way that he treats his Pokémon is just awesome too. I personally like all the nicknames that he gives the creatures. He treats them like individuals. Satoshi just doesn't use nicknames.
The fact that his Pokémon are different too is fine. Like the fact that he has Butterfree. Not a lot of trainers make it to the League with a Butterfree anymore in the anime.
I haven't seen him in Chronicles yet, so I'm not going to offer any more of my opinion. I said all that could be said on him already.