how far did you get, it starts out very slow paced, gets better towards the end, but it is kind of a "puzzle shooter" after you get the grav-gun
It's a puzzle shooter, but not really that much of a puzzle shooter. A puzzle shooter constantly puts you in situations where you have to figure out how to leave the area or escape from an enemy without being killed and in other areas manuever through a hazard that has enveloped an entire area, it keeps you constantly thinking about what you have to do. HL1 is 3x the puzzle shooter that HL2 is. The goliath bug looking alien that needed to be killed by alternate means, the sound alien in the rocket test chamber, marines with rocket stations in the tunnels, the crossbow inside the cage that falls into the water with the deadly giant alien fish, etc. I've played through most of HL2 and the closest to those situations is the ant lion beach section. Everything else was solveable by getting to the other side of the room/hallway/connected rooms or killing everything or doing a "very" simple physics puzzle. HL2 is MUCH more action focused than HL1.
Also, dude your not alone, I didn't like HL2 either. It really sucks to be out there and constantly have to hear about how great the game is from everyone the moment Valve comes up. I attempted to play and like the game relatively soon after it came out too, I was excited for it.