Ovechkin has had 2 distinctly different periods of goals scoring.
Prior to 2010-2011-2012 range, he was an absolute animal. A freight train who could beat you the length of ice, score at will from pretty much anywhere. And I say that as a Pittsburgher who has no reason to root for the guy but can call it unbiased based on reality and the eye test.
There was a strange downturn during his age 25/26 seasons. I've never really understood why a player like him, in his mid 20's saw such a drastic decrease in production despite not really missing time. Especially when you see what he was doing before and what he accomplished after. I've heard coaching and deployment as a reason, but that seems odd considering he's played under numerous coaches throughout his career and has always been the focal point (rightfully so) offensively. It's not like his shot totals cratered, though the efficiency did so part of it was him just missing more often.
2013 onward saw him start piling up Rocket's again but having watched a decent chunk of his games, he absolutely did not play the same consistent, kamikaze style of hockey that you saw during the first 5-6 years. He became a more stationary goal scorer, reliant on others to feed him passes and produce opportunities to let shots rip. I'm not saying that he didn't score amazing goals or still have the ability to power/drive his way to a goal but the frequency at which it was happening, decreased quite a bit.
Ovi has never been a particularly accurate shooter. In fact, he's downright poor relatively speaking against his peers. I'm working up a comprehensive study on shot volume and the difference between snipers (like a Bossy from an era past or Matthews as a current player) and volume/compilers (Ovi). A big factor that the casual fan (which makes up the overwhelming majority of people) doesn't take into consideration is shots missed, which sees Ovechkin soar even further ahead of his peers in terms of overall volume.
Ovi has won numerous Rockets in large part because he shot the puck far, far more than anyone else in the league. People call that a skill and scoff at any notion that evaluating efficiency but I find that disingenuous, lazy, and outright fraudulent if we're going to nitpick other factors of the game and other players in an all time light whether you are talking about goal scoring, assists, etc, etc.
Take for example 2008-09.
Ovechkin (56) won the Rocket by 10 over Jeff Carter (46).
Ovechkin shot the puck 528 times on net. Led league by a mile. Next closest was Eric Staal at 372.
Missed another 220. Led league by a mile. Next closest was Staal at 137. In fact, since he came into the league he's missed more than 1000 shots than the next closest player (Brent Burns). The next closest F is Carter, 1250 behind Ovi.
528+220 =748
Carter shot the puck 342 times on net. Missed another 116.
342+116=458
56/748=7.5%
46/458=10.0%
Ovechkin led the league with 5 EN goals
Carter had 2
Ovechkin scored 19 of his 56 on the PP = 34%
Carter scored 13 of 46 on the PP = 28.3%
Ovechkin scored 1 SHG
Carter scored 4
Ovechkin skated 23 minutes per game (led league)
Carter 21 (17th)
Is it any wonder why Ovechkin won the Rocket? He shot the puck nearly 300 more times at net than the 2nd place finisher. He relied on the PP more, scored more EN goals and fewer SH goals.
He's not required to engage defensively. He doesn't have C responsibilities in the middle of the ice.
There are numerous team sports that evaluate shot volume vs success rates, yet when it comes to Ovechkin, he gets a pass (generally from Caps fans and/or Crosby detractors) when you bring up volume being a big factor in why he was scoring the most.
There is a strong hesitancy to evaluate the different types of goals he is scoring, how many came on the PP (vs peers for example, Matthews is leading the league in ES goal scoring for the 5th time already at age 26 vs Ovi who has done it 5 times since 2005-06), how many are EN (Ovi leads all active players by a lot, 56, vs 2nd place Marchand at 33), etc, etc.
The simple reality is that having such a massive leg up in volume is always going to give you A, more chances to score, and B, allow the player to be less accurate and still obtain the most goals despite most everyone else being much more efficient in putting the puck in the back of the net.
Nobody denies that he is an all time great goal scorer, many say the best ever. I don't have an issue with people claiming that, though I do think there are better pure goal scorers than him.
Nobody denies that he is an all time great player (I have him in the 10-15 range which is very reasonable and an unbiased ranking IMHO).
But he has always been an offensive only player, a winger, who's back half of his career saw him rely more on his teammates to generate scoring chances and has benefitted from a system and team strategy that forced him the puck, often at the team's expense. He has been uneven at best, as a postseason player (the only years that register for an all time great were 2009 and 2018), with team success an absolute knock relative to what he and his team did most years in the regular season. He's been a net negative player 10 out of 14 playoffs. The Caps have advanced past the 2nd round ONCE in those 14 playoff runs, often losing to teams that finished lower in the standings and again, it's not like it was Ovechkin and a bunch of nobodies. His international success in terms of best on best tournaments where most/all NHL players are participating, like the Olympics, is also bleak.