There's nothing wrong with requiring juggling for some levels. A few out of 51 is nothing to be concerned about. Stick to the levels that don't need it if you hate it so badly.
Besides, if any level is completable without juggling, then when you DO juggle it becomes far too easy. Think before you complain...
Seeing as there are quite a few people getting past wave 20, Sikes, then obviously the issue lies not with the game, but something you are doing (or not doing).
I don't think fame has anything to do with claiming titles, unless there's some other way of obtaining it rather than through searching the town.
You get new titles simply based on the level, I believe.
If you're stuck on the survival waves, try to stay away from the center of the screen (vertically) that way you'll only have 3/4 sides shooting at you at a time.
I've made it to 69 (on easy), using nothing but blade shooters, cannons, pineapples (extremely useful against large groups of units that come out of the MoaBs), and 1 monkey beacon in order to increase firing rate.
Once you go into free play you get around 1/3 as much money as you should from your kills. Is this a glitch or intentional? Either way, I think it should be changed so that you continue to get 1 money per balloon popped.