Warren's all time high win shares in his 3rd season (4.2) and Lavine's (3) are right there with Smart's high in year 3 (3.2). Smart has 3 years with WS at 2.6+, Warren has 2, Lavine 2.
Those guys' teams were awful and that makes it hard to get win shares, but they're right there with Smart. You're also calling these scorers 'inefficient', but they each shot 55%+ TS% in a 2 year stretch over their 2nd and 3rd years, while Smart's career TS% is 48%.
His best season was his rookie year, 49.1%.
The win shares are close, and the guys you're calling inefficient look like Steve Nash compared to Smart. Lavine has considerably more upside than Smart and Smart's highest PER is lower than Warren's lowest, and Warren's top 2 WS seasons beat Smart's best. There is ample evidence to support my stance in stats and the market.
I also like Smart. You said 'solid' in your other post- I said that previously on the same page.
I don't think Win Shares is going to accurately measure Smart's value. It's a box score, counting numbers driven statistic, and Smart, well, he's not a box score guy.
Compare stats like VORP or BPM among Smart, Lavine, Warren -- Smart comes out on top by those measures, easily. That's not to say those are perfect, either. But I think you need something that tries to measure success of the team while the player is on the court rather than counting stats.
Edit --- Saltlover beat me to this analysis.
Warren and Lavine both have a career TS% around 54% and usage rate trending toward the mid to high 20s. That's fine, but it's not particularly great for volume scorers.
Then you look at the fact that they're poor defensively and they don't contribute a lot in terms of rebounds or playmaking relative to their position and they start to look, so far, like high usage bench scorers rather than a major piece on any good team.
I guess we both agree Smart is "solid," but you have different opinions as to the value of guys like Warren and Lavine. I don't think those guys have shown enough to be considered better picks than Smart, to this point. I feel the same way about Jabari Parker, who has had a lot of injury problems and can't play defense yet. Rodney Hood, similarly, has had some flashes / stretches but has yet to establish himself as a reliable contributor to a good team.
Meanwhile Smart has been a huge part of a team that's gone to the Conference Finals two years in a row.