It's no mystery the Ryuusei/Shooting Star series isn't nearly as successful as its predecessor both commercially and critically, but why? Why is the series looked down upon and ridiculed by so many? As I see it there is one big reason: Long time EXE fans were turned off by the restrictive, overly simplified battle system.
The EXE games contained a very complex, tactic like system where one could utilize Battle Chip "codes" to create unique play styles. This system offered a broad range of depth and variety with limitless combinations. In addition, players were free to utilize a 3x6 grid to avoid attacks or execute specific strategies for the kill.
Unfortunately, SSR stripped the player of these mechanics by limiting one's movement to a single row and disposing of the Battle Chip code system in favor of the overly simplified "color coded" system. Sure, the system can be viewed as a bit more accessible than the coded system, but to EXE veterans, it was a a huge step down from the variety and depth of the former.
Thankfully, SSR3 introduced a few new bells and whistles to make the battle system a little more complex, however it still doesn't hold a candle to that of its predecessors'.
That said, where do you believe the series fell short? Why could have Capcom done to make the series better?