My opinion on FF7 is heavily biased by the fact that I didn't play it around the time it came out, but about 15 years later. As such, I knew Aeris was gonna die, and didn't establish any sort of emotional connection with her like I imagine I may have done as a 9 year old. When I did get around to playing it last year, one thing that immediately stuck out to me was loooooooooooad tiiiiiiiiiiiiiiiiimes. Most of the RPGs I had played previously were cartridge-based (earlier FFs, SMRPG, Pokemon, etc) and thus loading wasn't an issue; and the disc-based RPGs I had played (Baten Kaitos, FF Crystal Chronicles) loaded quickly. Now, I'll put some blame on the hardware here (I only had a PS1), but even if the battles loaded quickly, I'd still probably think the pace of the gameplay was on the slow side. I've thought this about FF9, too, so it's not just a problem with 7. But these are reasons why I prefer earlier FFs over 7.

I can see why people like FF7, it's just not my favorite. Show me an objective proof that FF7 is the best in the series, and I'll concede; until then, you're free to have your own opinion and other people are free to have theirs.

tl;dr