Agreed. I like Bloodlines but I don't get how it's better than CV4 in any way and I've been running into a lot of people lately who think it is. 
From my personal opinion, the music. More if you take into consideration that Michiru Yamane did it in 2 weeks.
But that does not mean SCV4 music isn't spectacular. I think it is one of a kind when it comes to CV soundracks (like HoD is, but in a different way and infinitely better).
Anyway, the fact that I like the Bloodlines more than SCV4 doesn't make it a better game, I recognize that.
And, also anyway, the fact that it's not in my favourite CV games doesn't make it a mediocre game, not even a good one. It's an excellent game with some unique atmosphere, gameplay and soundtrack, that has aged perfectly, and it's a symbol of the 16-bits era that used some amazing technical display, which must have been jaw-dropping back in the day.
If SCV4 isn't part of my top 10 CV titles is because I like the others better, but it still is, both objectively and in my personal opinion, a game worth of 9 points if I were to give it a score.
And I made the thread not because of me, but because I was surprised that so many fans didn't hold it so high as I thought. I believed it was the favourite of everyone who played it back in the day.