[SparX]

So Side scrolling dodging can be a hassle until you get in the groove. Often times you can't go back, and if so only a small amount, so going back to find different footing or to get out of the way of a charging enemy means relying on very precise jumping skills. Granted, some side scrollers (Thinking like streets of rage) give you a bit of room to move side to side to dodge, but most side scrollers seem to follow the very 2-d principle of scrollers.
With the Top/Down style, you have the ability to move in all 4 directions when facing the enemy. This can make it easier to also dodge multiple attacks. You are also generally given a whole room of space to work with, so you can double back on enemies easier, or run around and leave traps for things that follow you more accurately then the above system.
With Isometric I will ignore simulation type games, because those run on computer randoms and you can't usually control exact people in your army to dodge oncoming computer attacks.
So games like Diablo I of course have a fondness for perspective wise (probably because of my fascination with pharaoh games growing up and diablo too XD) They offer the ability to move in a full circle, and SOMETIMES change the perspective to see behind walls, or will change the opacity of buildings/walls so you can see behind them for enemies. I find it generally easier to get in the groove of playing techniques with this style.
I also in generally have a weakness for the 3/4th angles on everything (Drawings of people, pictures of people, animals, flower, etc etc) I find it more aesthetically appealing (holy shit I spelt that right first time D:) then a direct view, and generally find side profiles unappealing D:

Hope those are the kinds of opinions you were looking for XD