If, and I mean a big If. If, a system could be implemented nationwide to perform background checks for any purpose, including employment. As long as that system had 24/7 uptime, and it didn't keep records. Then and only then would I be OK with NICS.
There are a number of problem, such as:
1) By limiting the Hours of NICS, the Government is creating a virtual Blackout period in which nobody can buy arms.
2) NICS isn't "unreliable", but rather it is poorly administered. Politicos can shut it down on a whim and create a virtual NO-GUN time period.
3) The Federal Government is keeping illegal records of Gun Owners. And, in cases where the check is initiated through the State or Local Government, they also get the records. All of which are used to compile a registry of Gunowners for an eventual confiscation and total disarmement as per Current Federal Law. See "OH SHIT IT'S CONFIRMED, THEY WANT OUR GUNS" For more Details.
4) By requiring the Buyer to pay for the NICS check, they are placing another hurdle albeit a small one in the way of Gun Ownership. I have to pay $8 for the NICS check even if I was buying a $10 Raven. For example, I can buy Ravens for $10 from time-to-time on Gunbroker (though I haven't bought one.) But, in order to receive the Gun interstate it must go through an FFL (in order to perform NICS) which costs an additional $20 - $30, for the FFLs time and the $8 NICS Check. So the $10 Pistol is now $30. That inflates the price 200%. On a $1000 Gun this amount is unnoticable, but when buying guns that are less than $100, the check is very noticable. I have bought 22 Rifles for $39 - $79. And, the $8 NICS Check is very noticable.
5) The rest of the costs are passed on to the Taxpayers.
Solutions are:
1) A Law that states that if NICS cannot determine in 1 Hour whether a person is prohibited that the sale shall be allowed to continue.
2) A Law that states if NICS goes down for any reason that a NICS Check shall not be required.
3) NICS Hours be 24/7/365.
4) The NICS system be expanded to a background check system rather than a simple Approved/Denied/Delayed system. This would require that persons other than FFLs be allowed to run NICS checks. For example, allow employers to do NICS checks on potential employees. This way, it would make it hard to tell who is a gun buyer and who is applying for a job. It would also defray costs so as they are not passed on to Gun Buyers and tax payers.
5) Rather than charging a ridiculous $8 per transaction, use part of the cost of an FFL ($50/Year) to pay for the cost of administering the NICS system. Non-FFLs could pay a fee, but his info. could be used to seperate Gun Purchases from other inquiries. Instead, each person who needs access should be expected top pay a small fee for access. This fee should be sufficient to defray costs, but not so much that it creates a noticable effect on gun prices.
So, what is wrong with this. It will never happen. NICS will always have blackouts. The powers that be will never agree to any law to allow purchases when NICS is down or can't determine eligibility.