Well, mono red is a thing is most format, mono blue is mostly not. Red is one of the srongest colors, and your perception is quite selective, if you don't mention Lightning Bolt
, which is the single card with the biggest impact on modern. (You could even argue most of Snapys power comes from flashbacking a Bolt.
Blue's strenght is more a myth from the old times, when it actually was the best color by far. But today it is not, especially if you see the banned cards for what they are: Meaningless (Jace, the Mind Sculptor
, soon also Dig Through Time
, Treasure Cruise
In the end I want no color to be the best, but instead each have their flavor. Right now Blue's flavor is flashbacking a red card. Compare that to Red (burning and charging the enemy down), Black (discarding and attritioning the enemy down), green (2 mana 5/6 beats) or white (uh...well the "sideboard color"). Blue's flavor should be being the control side, being able to say "no". If they print Counterspell, they can ban Snapcaster, if they print Force of Will, they can ban Delver. And blue would be more what is supposed to be.