Momentum Mechanic

You don't get it. They don't need a blaster to team up with. They need any AT that can provide damage while they tank. That means almost everything other than a few specific controller or defender characters.

On the other hand, if you need tanking, debuffs, buffs, healing, control, etc. The choices are more limited.

As far as soloing goes, again, with good skills or IOs blasters can solo as well as anyone else. With SOs or average skills, they quickly fall to the bottom of the barrel.

For these reasons, you rarely see blasters at high levels, especially with the ATs proliferated to both sides now. The blasters that do make it to high levels are usually played by better players, because they're able to manage through the introduction of all the CC that happens mid-game, whereas most players just give up.

IMO Blasters are just above stalkers and need some significant revisions to be worthwhile foe most players.

That argument can be made for every single archetype in the game, period. Blasters are supposed to be all about damage, and honestly, nothing can compare, not even a souped up farming brute.