Mixed bag I feel,
It is exactly the same feel of the first game, shortcuts are the same, voice and sound FX the same. Plenty more units of dubious worth to play with, and some cool stuff like massive walkers and oddities that would make you never build them all. Protoss have a carrier, a ground attack plane, an air attack plane and an air & ground attack aircraft, none of which are any good as I only build carriers like the first game. :)
But GFX issues like it doesn't work on a 64bit system on install, but then does. As if the installer doesn't know what it is doing. So upgrade everything from Nvidia. I am running win7 and my drivers are about 273.xx. On install it says you need driver of 193 something or other. So it can't read windows 7 or understand 64 bit by all accounts.
Also you can't run it in ultra as they still insist on use the havok and unreal engines so it is buggy, I had to run it in high to avoid stutter and slow down. Or you can do the windows 7 memory usage using CMD, taking it from 0 to 4, kind of helps. But you have to be uber sad to risk it.
No LAN play is a cardinal sin, you can play with your friends but they have to have a fairly hefty router and lots of broadband for you to play with a guy sat next to you in a cyber cafe. Blizzard really are retarded at times.
There is only 26 missions in single player. You get three choices that split the linear, you can't play both. That is 25 basic and three choice missions. There is also a hidden level to make 26th after a play through. But I am being pedantic and replaying is kind of alright.
Sadly after going online, already the spamming and sad 14 year old losers in this world have learned how to just churn out protoss and rush you. So without LAN and the same boring crap from the previous game, mulitplayer is boring. And £45 is fleecing you. The game took me a day of faffing at best, without LAN and a dodgy multiplayer it isn't great for that price.