Are people who are voting 3 just voting for the gameplay mechanics? Because the levels in 3 are so dull and have some terrible lines in them - the worst offenders being Suburbia, Rio, and the Airport - unless you LOVE to grind long, straight (or round) rail segments all day. The vert lines set up for more vert lines, and the rails set up for...more straight, boring rails.
Los Angeles is a massive disappointment, given how much the city means to skateboarding. None of the iconic spots flow into anything significant. Wasted opportunity.
Obviously, the gameplay is a lot smoother in 3, which is the only way I can fathom people voting for it.
THPS2 has some of the most iconic levels of the series that fit the somewhat stiff gameplay well. But, dang, having no revert is rough.
Neither game comes close to the flow of the levels in THPS4 - which is the peak of pure THPS gameplay.