certainly he is on fire, though he normally is in the early season if not quite to the same level. i think this year in particular he is leaving the giro and tour to quintana (perhaps eyeing up vuelta) so more focused on the spring racing than most rivals who are building slower towards GTs. but really, he is quite uniquely suited to these races and in particular fleche as a genuine top level climber who also has genuine speed.
as for his dubious past, if i remember correctly he was never actually caught doping as such, just "implicated". i find it funny the way different riders are viewed in light of their pasts... some cast out completely, some considered completely fine, valverde seems to be an odd mix. worth noting that his 2 years away from the stress of racing might be just the reason why he is able to perform at such a high level despite his age personally, i like him as a rider and see no reason to view him in any different light to anyone else wrt drugs
hoping quintana can come out of the giro well and movistar can be part of making a real race out of the tour this year
I kind of view him in the same way that I view most pro cyclists and how I view all of the NFL. These pro sports are not normal, the competition is intense, the money is pretty big and the show is awesome. When you combine all of those, you're viewing maybe a toned down version of WWE. It is money and business first, entertainment as a means to that and fair competition after that. The players in the arena will do whatever they will do to self level the perceived playing field to keep their paycheques and not get cut from the team and go back to bricklaying or selling cars or tractors or trucks or whatever that is less glamorous than doing pro sport. Given all of the above, he's on a tear. I trust that his path to winning is similar to a lot of his peers. He still has to execute on the field of play on race day, and you have to give that guy credit for being able to pull things off year in and year out.