Take Fifa for example, it just pisses me off that I can hardly dribble the ball because my fat fingers are sliding all over the place and covering most of the screen. Or I'm worried that I am pressing too hard and could even crack the screen.
Then you need one of these...
I won't lie when I saw one man on the bus using this neat little add-on for playing games on his phone I was jealous. Only right that I let The Man Dem know that a cheap solution is available.
Same device works with iPhones, Androids and iPads and other tablets (via bluetooth).

Info and purchasing options:
US: details here
UK: details here