By the way, on the topic of Taveres, IMHO the quality of basketball in Spain is quite high, but overall talent is poor. If you compared it to an average major conference like the SEC you'd see a lot more talent in the SEC (and that's maybe the 5th best basketball conference).
Most of the Spanish "stars" are 26-32. Looking at the list of 1st team All Euro League members (10 players per year, 2x each position) Tavares is shockingly young. At 23 he's the only member from 2010-present under age 25. Almost all of his contemporaries on the list were drafted a couple years before making it to that level (2008-2012) and mostly late first and high 2nd round picks. Most never had a cup of coffee in the NBA, so it certainly makes you want to take his success with a grain of salt, compared to NBA success, but there are no shortage of reasons to believe he couldn't be a competent NBA backup big for years to come.
My big knock is that lumbering behemoths over 7'2 who don't have elite offensive skills (Sampson, Smits, Ming, Sabonis, etc) never amount to much more than 3rd or 4th bigs. Their careers also tend to be abnormally short.