To be fair, most Kamen Rider games are terrible. Fanservice aside, that DS game was shallow as hell. And I absolutely think a sentai musou would be reds and sixths.
Which DS game? Rider Generation? While I'll admit the first one wasn't very good at all, the PSP version of Rider Generation 2 is fantastic. Great old-school style beat 'em up with a nice leveling system and an absolute shit-ton of characters. I've put a ton of time into it. And the Climax Heroes series...well, it started off
absolutely awful (small roster, shitty unfinished characters, etc), but by the time Climax Heroes Fourze came around, it had become a really good fighter, and Super Climax Heroes only improved upon that, to the point where I'd call it a genuinely great game. Go back further than that, to the PS1 and PS2 eras, and...yeah, only the Kabuto game is any good out of those. The rest are shitty cash-in fighters thrown together with little care for quality. The Kabuto game, on the other hand, had some really good ideas and was pretty unique as far as fighters go. And I know some people swear Seigi no Keifu is a good game, but I just don't see it.
But yeah, Super Climax Heroes and Rider Generation 2 are absolutely great games. And I'm sure Battride War will be as well. Things are finally picking up for the KR franchise, video game-wise.