Yeah, if you sign Gortat it's going to very likely be the full MLE. Is he worth it? Tough to say. He rarely ever plays with another legit big on the Magic. He's almost always on the court when Howard is out and he's surrounded by four shooters ... so it's difficult to gauge how he'd do without Duncan. It probably isn't a good sign that Van Gundy never pairs Howard with Gortat.
I don't like that he is whining about starting ... that wouldn't fit well in San Antonio. Even if the Spurs sign him, a Duncan/Gortat frontline might not always be what makes sense in the starting lineup.
I like his rebounding, shotblocking and overall strength in the middle. He's pretty damn limited on the offensive end so there's a risk he won't work that well with Duncan. But the gains on the other end are likely worth the offensive shortcomings.
For a one-year deal at the MLE, he makes a lot of sense. Multiple years? That's tough to say. The potential payoff in the 2010 plan (via free agency or trade) is probably worth more than simply signing Marcin Gortat.