3. Super Strength
When you become a superhero there's one thing you just can't avoid and that is a good old fashioned scrap. All other powers seem secondary if you can't actually beat the bad guy to a pulp before sending him to jail to serve hard time. For every superhero there's a super villain with their own unique set of powers and skills that will leave you deader than door nail before you can shout your world famous catchphrase. Therefore it is essential that you have the tools to defend yourself. Sure super speed is good for evasive action and invisibility allows you to hide and maybe sneak attack (unless you're blind remember) but nothing would be more useful to you than super strength. If you're opponent has you on the ropes then pick up a house and throw it at them. Managed to get the upper hand then why not swing them around your head and launch them off into orbit so they burn up in the heat of the sun? When you're not fighting bad guys you could save people from certain death in falling aeroplanes or lift cars off those trapped underneath just like in the famous Action Comics cover shown above. So what's the possible downside of such a truly amazing power I hear you ask? Well to borrow a phrase from Star Trek "Damn it Jim, you can't defy the laws of physics". You see as much as you might want to stop that aeroplane falling out of the sky you're actually going to make things worse by trying. By leaping upwards with your hands ready to catch the spiralling death trap all you've actually done is turn your own body into an incredibly powerful projectile that will simply penetrate the metal layers of the plane obliterating anyone who might happen to be in your way. The same would happen if you tried to use your mega strength to punch an asteroid - you could easily turn one killer rock into a rain of rocks that destroy far more than a single asteroid ever would. Imagine how popular you'd be with Joe public then! It's all about the size of your hands really - there's just way too much power concentrated into too small a surface area. So if you're planning on having this super power then I'd advise increasing your hand size by about a thousand times - and that'd just look silly.