tbh I'll play ME3 like Chris Priestly said. My favorites first, then the others. I hope that ME1s squaddies achievements will make a comeback (but that would require much more side-quests, wouldn't it?) to encourage me to test all the squaddies.
Basically, Vegas design is dull and theres nothing interesting about him at the first glimpse.
When I played ME for the first time, I took Wrex and Garrus to almost every mission, basically, because I thought "Oh gawd, cool looking aliens and dull humans, I take the aliens to my squad!". On later playthroughs I brought Kaidan and/or Ash with me and I realised, that they are great characters as well.
ME2 had worse team interaction, but it still delivered some complex new characters, which were overshadowed by e.g. Mordin, Legion or Thane (I include him in my top 3

). This will be the exact case of Vega, imho.
at initial stage, everybody will hate him.
then, everybody will ignore him
and finally, nobody will notice the moment he will become cool.
Also, I'm kind of confused, that people watch MTV shows.