We look better with Carrick but I think there's a fair few factors involved which shouldn't be insurmountable to Blind. And with Carricks age and injury issues to disregard Blind would be silly, especially since he has done well as an understudy on the whole. He's still young, in a new team, in a new league, hit with injuries, playing multiple roles in multiple systems and is definitely looking tired which seems to have taken some toll. Why does this apply to Sanchez, Di Maria, Fabregas but not Blind? Remember, he played a lot in an incredibly demanding role at the WC equalling that of finalists.
He doesn't have the authority or presense of Carrick, he doesn't receive the same level of trust from team mates or respect from opposition. That's something that can come though, no one starts with it. Hell, Carrick lacked those just last season!
He's playing a high press game in a system with no cover for when they overrun. Sitting back, waiting and covering those channels is less risk averse, which is why Carrick has looked more comfortable and less dangerous. He just needs to pick his moments, or more, choose his teams better. He's got more interceptions in the oppositions half than any other player in Europe's top 5 league - that should tell you how good he is at it, along with his high tackling rate. It's just a case of finding the balance in our system (so there's a little more cover for it, else we just accept the natural risk) and doing it against the right opposition.
His more disciplined and cautious passing is far more a demonstration of his Ajax training than a question of quality. He's played some magnificent balls but looks to far less often. He chooses to rotate quickly through one touch passing because that's how it's always been for him, and likely what Van Gaal wants from him (he can ask Blind for different things than Carrick, despite playing the same position). Similarly on the high pressing - it's his natural habit to do so, there's no reason to think he couldn't sit a bit deeper and cover channels when required.
His footballing intelligence is massive. The German team who won last years World Cup used him as a case study for their defending through the knockout stages and into the final. A handful of poor games aside he has been one of a very few constants in a United team struggling for any semblance of long term consistency - and he's done it against the odds (new team, league, systems etc. mentioned earlier). His capacity to learn seems huge when you consider it all. Take away that new league naivety, give him a proper rest and with time I expect to see more freedom of expression in his passing and a more pragmatic approach in his defending choices (high press/deep sit).
No, he's not Carrick. But 24 year old Carrick is a far different animal to the beast we have seen lately. All the same stuff was thrown at Carrick before.. infact, Carrick was essentially the Tom Cleverley before Tom Cleverley in that regard. He was the personification that United fans had for 'not good enough' and 'passenger'.
Footballs a thinking mans game. Don't discount Blind. He could be absolutely massive for us yet.