I wouldn't give the first one on PSP even 4/10 and it looked like a bad game, not a bad convertion. Considering it got a lot of 9's and 10's on iPhone, I don't trust the reviews. Are the sequels any less crap?
I bought the minis version on my Vita the week I got it, figuring the free version that came preinstalled on my phone wasn't that bad. I was very wrong. The minis version is a complete piece of shit. The second analog just makes the digital aiming more awful, and the graphics are a HUGE step down from even the super old iphone version. I paid $5 for it and put in maybe 20 minutes. It's so bad. 2/10