All signs pointed to this being unenjoyable for me, but hell it was cheap, and as we know Valve have complete dominion over our finances during the Steam summer sale.
Anyway, I played half an hour and was put off by the cringeworthy videos and surprisingly poor graphics (there are some good character models but the general scenery is reminsicent of a PS2-era title). I pushed on though and I'm glad I did! For some inexplicable reason, despite the fact that I dislike on the rails games, quicktime events, cringey comedy, button mashing... I found this really, really fun to play.
The ridiculous combos, though very easy to pull off, are a lot of fun and it's satisfying, in a 'channel your inner 8 year old' kind of way. Seeing a motorcycle leap off the group and kick the crap out of enemies in a pseudo-Transformers fashion never gets old. The gameplay is pretty varied in general and though Twisted Pixel walk the line of overusing mechanics, they don't quite cross it.
IRIS is a good character with entertaining dialogue, though Pablo wears thin quite quickly, unlike his trousers. Some of the acting is atrocious in the video sequences and the jokes within them will miss more than they hit, but clearly Twisted Pixel were going for a campy, 90s-apeing style of comedy, so I can't be too harsh.
The game is smooth to play, with a clean interface and hardly any bugs. I once managed to turn Iris 180 degress after hitting a wall but it quickly sorted itself out, and bar one game crash, that's really it in terms of the technical side.
+ Fun in a pure, childish way
+ Skill trees add a sense of improvement and choice, and encourage you to keep playing
+ IRIS is no GLaDOS but still has some funny and generally enjoyable dialogue
+ Good campaign length -- the game doesn't outstay its welcome
- Reading Pablo's subtitles whilst driving -- poor game design!
- Limited replayability
- Sometimes a little too easy and simplistic
- Weak graphics, in spite of huge file size (no doubt due to the live action videos, which do look nice and crisp)
All in all, I can't even rate it out of 10. This isn't a game that can be summed up in a concise, empirical manner; some people would find it to be a 2 or 3, others a 7, 8 or even 9. It is a weird game, and in many ways a poor one, but if you can grab it in a sale, and you've got the HDD space, then give it a spin. Or a cycle, even.