How can you say there are no mediocre songs when two have already been released?
In fact there are more than two!
The highlight of the album for me is Bumblefoot. There are a couple of very nice solos which have a good mix of emotion and speed. My favorite is definitely on "Alive." Does he compare to Petrucci's emotional solos? No, but there's some very nice playing and also some totally insane playing as well that is quite unique.
Overall though I find the album boring as a whole. Portnoy's playing the same fills as he has for the past 20 years, Derek's playing the same runs that he's been playing for 20 years, and many of the instrumental sections are just boring IMO. I do enjoy the use of the B3 organ throughout, and Derek's solos on that instrument are much better than his synth ones, which except for 1 or 2 are just warm-up exercises.
Almost the entire album is rocking or otherwise heavy...very few soft sections to be found. I find this tiring. Some will love it. It's similar to TOT in this aspect.