I would like to summarize the criticism as far as I have seen it:

4. The FUDstorm

There is convincing evidence that MEGAman/fat mike/gorilla jam posters are part of a group or sockpuppets of an account
that is delivering on a promise to derail the SC thread after failing to extort 0.5 BTC from the dev team.  
The dev team has responded calmly and carried on, which inspires confidence.
The concern is always that trolls manage to derail or anger the dev team enough that they withdraw,
this has happily not happened and in my opinion is why you need a team of dev rather than just one dev.

A new community self moderated thread has risen in response to the extortionFUD but there are problems with that as well.
Unfortunately the side effect of serious trolling is that it galvanizes the community and creates mindless yes-men who want to protect their investment.
This is not always positive and we need to be vigilant to this. Too much hype can kill something as effectively as too much FUD.

My take on it:
SC dev team have managed this as well as possible.
The problem is now that with the extortion, everyone is sensitized to criticism and wonder if negative comments are part of the same FUDteam.
Hopefully responses can be tailored to specific criticism (as in the Cryptodevil case) and not all criticism criticized for being critical.



5. The 4.5% premine

Initial premine was planned at 2% but there was lot of early pressure from community to halve the second POW payout and so give earlier investors more incentive.
The payout was halved, so dropping the total number of coins created and hence raising the % of premine.
There has been some in community asking for premine to be destroyed and some strong reactions against this.

The obvious concern with the premine is that devs could desert the initiative and sell off their share and so crash the price.
It is obvious that a lot of work has already gone into creating this coin and that a lot more work is planned.
I for one would hope that devs become rich from this venture but only after enriching the world by delivering innovation and creation.
The addresses containing the premine is public and movement of the funds can be watched.

My take:
I see a need for a dev fund. I don't see fundamental difference between 2% and 4.5%.
I hope the devs also bought or mined lots of SC on top of that fund.



TLDR:

Valid criticism to dev attention to detail but important things have always worked or been fixed immediately.
Some details have not worried the dev team but it does worry some in the community. (Community participation can help to fix details.)
There is ample evidence of dev team competency, just look at the wallet and the fact that others are now copying SC wallet.
There is a vision contained in white paper that could change wallet functionality.


Disclaimer:
I own some SC but not enough that I will be able to retire if it is $10 per SC.
(I plan to keep all of them until I can used them without turning into anything else.)
I am bullish on SC and think that it will increase in price.