Trying to get some opinions!

My fiance is playing through the half life series for the first time, and I have never been more excited!

She has already made it to on a rail with half life 1 and then I showed her sven coop. Which now we may be playing together.

I figured hl1 isn't that big of a deal when it comes to shock and awe. I think that game won't be ruined by some multiplayer mayhem.

However I was thinking of playing synergy with her as well. From what I can tell the loading screens aren't as seamless. I'm more worried about difficulty and if having a second player would ruin the immersive experience.

What do you think? Would something like synergy have ruined it for your first time on hl2?

Thank you all for the feedback!