Futera
Definitely more doubt/debate over the authenticity of their autographs given signings do not happen in private and players are not paid for signings. Without a doubt, this is the biggest negative compared to Topps, Panini and Upper Deck who have the private signing sessions, however this is the way Futera operates.
As such, the autographs appear rushed, inconsistent, (at times) illegible and not consistent with what collectors believe to be an "authentic" autograph of the player. It's just the nature of how they operate - if you ask a player to sign 60 of the same card after training while they are sitting in a car and wanting to get home, there's no doubt you will get autographs which are inconsistent and some which are probably just a squiggle! However, this does not mean the autograph is "not authentic". I find there are a lot of naive people who just claim "just because it doesnt look like his full autograph it's a fake".
Personally, having collected autographs for a long time and having obtained autographs in person from multiple sources, the consistency of the autographs from the same players differ greatly (I mean greatly!), depending on the situation. While there have been players who have have specifically mentioned on Twitter when shown a picture of their apparent Futera "autograph card" that it was not their autograph, it could very well be. I am not saying they are lying, but these are high profile athletes who probably sign hundreds if not thousands of items in a given week where they are rushed and probably not even looking at what they sign.
For example, Lleyton Hewitt is a good example of someone whose autograph differs greatly depending on when you get it. If you get him at a private event his autograph is amazing and full and actually takes a long time to do. If you get him after hitting on a practice court at the Australian Open in 45 degree heat with 200 people asking for his autograph, you will get a scribble. It is still his "authentic autograph" but probably not what collectors would want when it comes to a trading card autograph. In some regards, this is what I compare some Futera autographs to.
While I think Futera's practices when it comes to collecting autographs have improved recently (this 2014 series will be another improvement) where details are provided as to when and where a signing takes place, the same issues remain when compared with Topps, Panini and Upper Deck when it comes to how "authentic" their autographs look. However, I do think they have been listening to collectors and trying to respond to what we want.
I do feel that at times Futera are given a hard time because their autographs are obtained in what we see as trading card collectors as unconventional means. I don't think they are forging autographs of players and releasing them as authentic - it would make little sense for them to do so from a business longevity perspective and for their reputation. All their released always sell out and there is a strong demand for them.
That being said, I am obviously more convinced of an Upper Deck/Topps/Panini autograph being "Authentic" compared to a Futera autograph, but I am not one who will jump up and down and claim they are fake because they look a bit off. I acknowledge some of them don't even resemble anything close to what a full autograph would look like, but if you don't like the look of it, don't buy it. It's a totally different matter declaring that the company sells "fakes" knowingly.
The Futera series is seen by a lot of collectors as the premier series for soccer cards and the 1/1 Gold Plate autographs highly sought after and fetching some very high prices. A lot of collectors, especially high-end collectors in Asia prefer these very limited and rare cards. I know a lot of collectors who only collect the 1/1 cards because they feel like the mainstream series' are too mass produced and will not retain their value.
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My 2 cents. These are my opinions - feel free to disagree and agree. This has taken a lot longer to type up so I am sure I have missed some things out.
Each to their own really. We have a choice in terms of what we choose to buy and who we choose to support and who we don't. I support all of them and am happy that we have the option of multiple companies. Look at the poor AFL...