Well, I went like 3-2 vs Tenks with one proxy stargate thrown in because I got pissed. If you get behind and you aren't the superior multitasker the game certainly makes you work for your win, it feels almost a bit like PvZ. You really can't afford for any drop to do any damage, maybe only a few probes, unless you sit on 3+ bases. I also had to change my immortal hotkey after the game you went mech because I was constantly hitting U instead of I. I still think medivac speed is bullshit, at least straight out of the gate, because vs anyone with decent micro you really can't punish the drops, but the phoenix opening seems to work just fine. I also need to find more uses for mothership core, but my colossus timings are really razor thin is it is. Oracles sound really cool and they can clean out a base really fast, but you can't even use them so snipe drops (too slow) or in combat (less range and even more fragile). They are a bit better in pvp because stalkers suck so much, but that's it.
The beta is definitely worth it, sure you will probably get more balanced product at release, but playing with batshit crazy units is part of the fun (void rays, wtf are they thinking ? ...)