seems like we're talking about two separate issues: a) whether good players who come in from other leagues should be automatically placed in the ASG without playing a minute and b) whether good players who come in from other leagues go on to become top performers in MLS.
(a) is complete bullshit, and (b) sometimes happens, sometimes doesn't. the league is already very heavy-handed in their tactics to get foreign talent to come here (i get the league's effort, and i get the occasional backlash against it from existing MLS players), but it's more or less been a balancing act that hasn't gone too far off the rails one way or another. these unnecessary ASG designations send it over the edge for me, and pretty much universally everyone else from players to fans.
it's not like the fans were clamoring for their inclusion and they didn't make the cut - it's just a business decision by the commissioner which is wildly unpopular and antagonistic to the rest of the league
I won't dispute you on Topic A. But, it's very different to argue (1) they shouldn't be all stars because they aren't MLS players yet and (2) they shouldn't be all stars because they haven't played against MLS talent yet and, therefore, haven't yet proven their value. I can see argument 1. I think argument 2 is pretty Fake Sugar Dick (WARNING, NOT THE REAL SUGAR DICK!) given the level of talent in top Euro leagues compared to the MLS.
regarding stars from top euro leagues that landed in the MLS, I don't believe there are many, if any at all, who haven't been stars in the MLS. The fact is that there haven't been many of them in the first place. the only real stars I'm aware of are Keane, Beckham, Henry, Villa, and Kaka. Obviously Lampard and Gerrard just got here. And then there are a whole host of Americans that have returned to the MLS from euro leagues and all of them are stars. I'm sure there are some guys that floated around internationally before coming to MLS. I'm just not really finding many guys that were successful abroad and then came to MLS and couldn't cut it.