Half-Life: Opposing Force is the official expansion to the popular FPS game, Half-Life.

Pros:

• Well-constructed storyline set in an alternate universe
  
• New enemies and weapons, enhancing gameplay variety

Cons:

• Lack of any innovation in gameplay mechanics compared to the original Half-Life
  
• Short gameplay duration

Overall, Half-Life: Opposing Force is a solid expansion for fans of the original game, offering new experiences and story, but it lacks innovation and longer gameplay.

👍

Love this game and Corporal Shepherd is my favorite half life character. This game is just as good as the original

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Genuinely should not exist. AI is ♥♥♥♥, I was literally attacked a few times by soldiers who were supposed to be on my side. They also get stuck more frequently than in any of the other Half Life games.
Story is also literally terrible like?? Confused me more tbh. Thought I was going to be seeing more of, you know, the killing of Black Mesa personnel but I was like teaming with them instead? The military are literally the ones massacring the facility in the other games, I really don't know what they were thinking trying to frame them as complete victims to the situation and upcoming heroes. I didn't want to play as just another good guy, I wanted to play as someone tasked with killing the personnel and the potential issues military members could have found doing so. This just pissed me off. Everything I dislike about Half Life is also present in this, I will not restate that so go read my review on Half Life if you are curious about other main gameplay issues.

Why do people hate this game so much (according to YouTube)? It's fun and it's one of the greatest!... PAINS IN THE BUTT!

It's just kinda lame.
Story is basically non-existent, enemy encounters are more annoying than enjoyable with how many pop out and surprise you, I just can't really think of any selling point here beyond get this if you want more Half-Life.

This game is IMPOSSIBLE the mission "Friendly Fire" is STUPID I can't beat it even savescumming between kills, the female enemies that run super fast are one tapping me as soon as I turn the corner FRICK half-life, I'm never playing it again.

harder than half life 1 but equally as enjoyable

I was not equipped for Race X ♥♥♥♥♥♥♥♥♥ talk about a difficulty spike.