The quality of each color tends to depend on what you want out of legendary banner, I personally feel like the value of skill fodder plays a huge factor [especially] for the red pool given how bloated it is, so being a good red on its own isn't super enticing unless they have good skill fodder too. I think this red pool is one of the worst we've had in that regard since Lene is inferior Olivia and Safeguard+ isn't particularly great, while Reinhardt has really bad fodder for a 5* unit and isn't overly meta-defining, even if he's a bit more unique than your average sword cavalry. This all changes if they're units you actually want but I feel like Marth is the only particularly fancy one. Granted calling him a fancy unit is a huge understatement.
I like the blue pool the most though because Fjorm merges are always good and Nephenee has Wrath, while the worst outcome still provides Aether fodder, but if you don't care about Fjorm merges then blue is also very mediocre. Overall I'm not super impressed with the selection though, Marth, Nephenee and Hector are great options but the rest are only interesting if you have a specific need for what they offer.
I am actually glad Lene and Reinhardt are here though because those two are the last 2018 reds I wanted to see on the September banner with Ike. Based on this current banner I'm expecting next month to throw Bridal Tharja and one of Karla or Elincia on there which would be incredibly good for me. If September gives us FE4 and another seasonal banner then I'm going to have a big stock of orbs for Ike (currently 288).