The Gravity Gun was fun for a while, but I hated getting hit by bullets, just because the gun didn't work from far away.
I like to play my games perfectly. Minimal damage, always carrying maximum ammo. Yeah, it's a pain in the ass to play it like that.
The story was decent. Not half as compelling as in HL1. (Same with the environments btw.) Weird ending though. I wonder what Episode 1 and 2 will bring. Don't worry, I will play them. (So don't spoil anything!)