Fair enough. That opinion is as valid as any other but not particularly helpful in identifying why 4E isn't fun for you.
This is one of the many reasons I enjoy OD&D so much. Stat generation is very random but there isn't this feeling of hopelessness if you don't get certain benchmark scores and if another player happens to get a higher stat than you, it is NOT going to make your character worthless in comparison. The difference between a 12 STR fighter and an 18 STR fighter is that the stronger fighter gets an XP bonus and can carry more stuff. In AD&D a good % roll could mean as much difference as +3 to hit and +6 damage, which does make the 12 STR fighter look very wimpy in comparison.
The fact that a character, no matter what scores get generated, is only as good as player's decisions in actual play is a feature not a bug.
I can to a point, but those are the breaks when you play a game in which the actual contributions of the player are largely marginalized by the system. If nothing of meaningful importance can be accomplished without hitting a benchmark on a die roll then get used to this type of dissappointment and suck it up. It was the game you signed up to play. You knew going in, that game revolved around menu options and target numbers that had to be hit. When playing such systems you can have strings of really good luck AND bad luck. The point is, if you are only satisfied and entertained when experiencing good luck, you are setting yourself up for a letdown playing such games.
When you allow your feeling of self worth to be attached to and the game measures meaningful contribution to be determined by how well the dice roll, this kind of thing will happen very often. I have been playing a bugbear fighter in a friend's 4E game for about a year now and if I had judged satisfaction and fun purely on the luck of my dice then I would have quit months ago. There have been good streaks and bad streaks and a fair amount of meh thrown in for good measure. Through it all, the laughs and good times experienced with friends had very little to do with the outcome of the die rolls.
I found the game extremely boring, it was an intense chore to play. I didn't like the gamist rules and the heavy emphasis on combat and builds. I don't like having powers and I don't like the sameness feeling I get.
Just the tip of the iceberg.