Ricciardo was very impressive even before being promoted to Red Bull in my opinion. I didn't notice at the time mind you, but in retrospect the signs were there, especially in qualifying.
In 2011 he was dumped into the backmarker HRT team midway through the season without ever having driven the car. Despite this he tied Liuzzi 5-5 in qualifying and beat him 4-1 in races.
For reference Vettel was dumped into Toro Rosso midway through 2007 in a similar fashion to Ricciardo, but was actually beaten by Liuzzi 4-3 in qualifying and 3-1 in races, although he outscored Liuzzi 5-3 (12-10 under the modern system)
In 2012 Ricciardo beat Vergne 16-4 in qualifying and 10-8 in races, but lost 16-10 in points (although his average finishing position was slightly higher). Then in 2013 Ricciardo beat Vergne 13-6 in qualifying, 7-4 in races and 20-13 in points.
I just don't see how Ricciardo was not impressive at Toro Rosso, but Sainz and Verstappen somehow are. We didn't have anybody to compare them to, but both Ricciardo and Vergne had very strong junior careers, arguably stronger than any other drivers on the grid then or now bar Hulkenberg.
Furthermore, Tost and Verstappen have both made a lot of noise in recent times about the Toro Rosso chassis being the second best on the grid, behind only Mercedes. If true then neither driver is having a good season. Verstappen is only in his second season of racing so is still early in his development as a driver, whilst Sainz's junior career was merely decent.
EDIT: Also don't understand the dig at Ralf Schumacher. He was very closely matched with highly rated drivers like Trulli and Montoya.