The cost is yes, one of the main problem of the game, the base price of the game with three characters is already the same price (or maybe more) than Battride War 2. But the main problems that the Japanese fans are talking about is the overall game. I'm going to list out the complaints that I can remember :
- Nearly all of the contents are reused from Climax Heroes and Battride War.
- No interaction with the Riders, heck they don't even talk during cutscenes.
- The unforgiving difficulty spikes.
- Reusing the same stages and bosses over and over again.
- No love for the original character, as in Riders just randomly become mooks, even main Rider like OOO Burakawani.
- The Rider Gate being unresponsive.
- Horrible load time.
- There's really no need for this game to be a Rider game considering the setting.
- You need to buy more figures to get everything in the game.
- You cannot jump normally, making airborne enemies like Raydragoons and dodging hard.
There's many more that I don't remember or just can't read since it's in Japanese. There's an in-depth review in KOTY web, but it's in Japanese and Google Translate won't really help much.
http://koty.sakura.ne.jp/index.php?2014%C7%AF%20%C2%E7%BE%DE (KOTY review of SummonRide)
http://koty.sakura.ne.jp/index.php?2014%C7%AF%20%C1%ED%C9%BE (The nominates and winner of KOTY 2014)