No, that second link isn't just opinion, it's flat wrong.
1, 4, 6, 7, 9, 10) Listed together because these are the same, asinine talking points that pretty much every jackass political hack spouts. If this power wasn't possessed by the Federal Reserve, it would be possessed by the Legislature and expansion and contraction of the money supply would become a political bargaining chip. As such, the money supply could be manipulated when it's not supposed to, or remain stable when an increase or decrease is called for. In the end, all four of these issues can be addressed by simply electing better representatives instead of voting for a bunch of clowns who bitch and moan about everything but don't actually do anything to fix them once in office.
2) Our currency is, basically, a commodity. Therefore, it's value isn't based on how many dollars there are in the system, it's based on how much everyone else thinks it's worth. The Federal Reserve expanding the supply of money is a contributing factor to the current low value, but it's far from being a determining factor.
3) The money supply can increase without de-valuing the dollar, because the dollar is, essentially, a commodity. Therefore, if demand for the dollar increases at the same rate as the supply, the net value of the dollar stays the same, which is not only not bad for the middle class, it makes saving money a much more certain game.
5) Plain false. There were economic booms and busts before the Fed was established, and IIRC they were more frequent and more severe than anything since the Great Depression (which was caused by a credit crisis not unlike the one that caused the Great Recession). In fact, the longer the Fed has been around, the better people have gotten at running it, and the more stable our economy has become. Do you remember the Dot Com bubble burst in 2000? That was nothing compared to your average 19th-century recession.
8) By this argument, imprisoning criminals for murder is also unconstitutional, because there is no anti-murder law in the constitution. Also, constitutionally speaking, black people have what... 2/3's of a vote, compared to a white person's one vote? Then there's the whole non-landowners can't vote at all bit. Seriously, stop bitching about the Constitution. It's flat incapable of accounting for every little thing we're capable of doing in today's world, and has been changed from the "founders' vision" almost 30 times throughout history (and Republicans want to do it another half-dozen times, to boot). It's not inclusive like D&D where if it's not in the rulebook you can't do it, it's exclusive where if it's in the Constitution then the Government can't do it.