Yeah. I think those are all very good points. I think they apply most strongly to the Superman franchise, where the old guy is just dropped in place with a kid in tow and our Superman is actually killed off. At least if you are a new52 fan of Batman, Wonder Woman, Barry Allen, Hal Jordan, Green Arrow, or most of the others, it's still "your guy", the new52 character, with added memories and feelings surfacing from before. They will still remember the adventures and the personal moments from the last five years. SuperDad spent the last ten years hanging in a small house in California while Lois played soccer mom and they raised their kid together. He has none of new52 Superman's memories or feelings, he is a significantly older character with a different life situation, he acts differently, etc.. It's worse than with some of the other lines where a character might "remember" an old friend or a romantic partnership from a previous incarnation (pre-Flashpoint), but is still the same character- Superman is actually a totally different guy.
It seems like we got the short end of the stick. Based on the spoilers from the standalone Rebirth comic for the whole line, I think I could deal with what they did to 95% of the other characters if I were a big fan of their new52 incarnations. They are going way further with Superman.