Still don't understand why this movie scores so low with so many fans
It's a good movie with a multi-faceted plot, two villains who have reasons to hate Tony Stark, the introduction of Black Widow and a government attempt to get the Iron Man tech.
Does it have issues? Yes. There's a lot in this movie, like many subplots and I've heard the argument yet again (a lame one, in my opinion) about a "weak" villain in Whiplash. That last argument is one I don't take seriously. It's just a nitpick that people who don't like the MCU's success use to damper fan's enthusiasm. It also doesn't work, at least not on me.
Pacing could have been a little more seamless but overall, its' a fun follow-up to Iron Man.