Personally I think it's fine. We have about 75 characters, about 10 farmable in arena, 10 in GW, majority available to shard farm and some chromium exclusives. I think general availability is good and the reason why other heroes that you may not usually used are in arena and GW shops is to get people to use them eventually once you've got the main ones you still have to spend your point and tokens on something right?
At the end of the day it's a business and the business model isn't to give everything away for free. You can see a lot of thought has gone into it to make certain characters harder to obtain than others which isn't a bad thing at all.
