The Maradona comparisons are unfair at this stage. Comparing a player in the early stages of his career to one who's finished is unbalanced. Maradona supporters will always look to Messi's poor international form and then compare it to Maradona of WC '86 when he was 26/27 - Messi is still 24. What people don't say as often is Maradona was wholly ineffective in the '82 WC when he was 22. Messi was 23 in the 2010 WC.
Messi has arguably not reached his peak yet, and that's a scary thought. I don't think the Maradona comparisons will be valid until he's in his 30s. They're similar players, and when Messi takes the league and CL by storm these questions will be asked. It's a sentiment to the player when you hear him mentioned in the same league as Pele and Maradona at such a tender age.
While this is true to an extent, I think 1. it's overplayed - in the same way that saying Messi was poor in 2010 is - as he was very good in the group stages and showed more in his World Cup debut than Messi has in any World Cup game (and maybe any competitive Argentina game) and 2. he wasn't playing in his best position in the same way Messi wasn't. He was poor in the second group stages though and that's all that's remembered, and this alone should show the high standards that all of the best players are held to not just Messi, for all those protesting when Messi is criticised. They're held to ludicrously high standards because they've set ludicrously high standards, because they're ridiculously good footballers. It almost seems like people get offended by the very notion of looking at Messi critically.
It's not Maradona's quality of play that Messi will struggle to replicate in a World Cup IMO, it's the ability to bring a team together and if not that then act as a one-man team on occasion to drive them on. His personality just isn't set up for it, he's the perfect team-mate not the one-man team. I don't know if this prevents him from being the best of the best, if charisma and ego is a factor in being the best of the best (or at least how they're perceived by the general public, in the way that Scholes' personality makes him less headlines and thus maybe less plaudits, or Xavi compared to Ronaldo) as two of the best players to play the game are known for their huge ego. Cruyff too I think? Are there other greats who have a similar humble, unassuming personality?
If he wasn't Argentinian this whole dragging a poor team to a World Cup wouldn't be an issue, though. Because he has these similarities to Maradona people want him to follow the exact same path, tick all of the boxes Maradona did...but then Pele never did this. Pele didn't have to excel in a chaotic team, he didn't have to excel in a team with players levels below him, he
just had to be the key part of this wonderfully sophisticated and beautiful jigsaw, like Messi. He wasn't the one who made Brazil tick, he wasn't the sole playmaker in the team, he was
just the one who provided that bit of class on top to take them from a team who played beautiful football to a team who played beautiful football and won things. Messi does the same for Barcelona. Even in terms of the role they played there's much more similarity to Pele than there is Maradona, as Pele was a scorer who creates and Maradona was a creator who scored - Messi's much more the former (that's not to downplay Messi or Pele's playmaking, it just isn't as prominent).
There's still much more to come from Messi, he's developed his game in the past few years and he'll continue to do so. Could anyone really have seen him be one of the most prolific players in the game? I don't think so, and I don't think that was just a simple progression that was something he worked very hard on. He's already shown he has the skillset to master every attacking role, now if he can go on to show he has the skillset to master a midfield role then it will open up a new dimension in his game. Maradona in 82' despite possessing a great(er) passing range was more dribbling-orientated in the same way that Messi is now, Pele was the same, so it's not outrageous to think we might to see Messi develop his passing game even more (or simply show more of it) and then those who are firmly in the Maradona side may be a bit less dismissive of the idea.