Earlier quoted context omitted.
Which ones do you think is one a par with it, and why? "vastly" may be an overstatement, but it's very good. The only issue is that for simple designs a smaller, free product (e.g. postgreSQL) may have all that you need. A lot of the new stuff in SQL server seems to be Business Intelligence tools, which I don't pay much attention too. the SQL stuff where you "select * from ...." seems to be much the same for several…
Well, while SQL Server has its merits, I wouldn't consider it vastly superior (or superior at all) to Oracle or IBM DB2, although SQL Server 2008 is indeed getting very close. Of course it depends on your requirements; for most purposes MSSQL is perhaps a better choice but if I needed an enterprisey-schwenterprisey zero downtime database server no matter what it costs, then of course I would go for Oracle or DB2.
The only RDBMS I worked with that was too limited for the enterprise ... is MySql. But that's because when you have a "Big Ball of Mud" it is easier to patch many things in the data-store and MySql has bad support for stored procedures / triggers / views and I also wouldn't trust it to store a data warehouse. But Postgresql was more than suitable for such a scenario.
MSSQL is also more than adequate for any task you might have.
I've seen this argument many times before ... that Oracle is more reliable. But with Oracle unless you have a DBA with years of experience to administer it, you're pretty much screwed. And a RDBMS that requires so much tweaking and maintenance just to keep it working doesn't seem so reliable to me.
True story ... while working at Adobe I participated in meetings about the future of Oracle at the company. Long story short: the company holds much of its data on 2 big Oracle servers and the problem with the setup is that it doesn't scale horizontally. And many newer projects are using Mysql, because it has a good-enough replication system and it also has a hidden gem (mysql proxy).
It seems to me (at least as an outside observer ... I'm not a professional DBA) that these are just effects of marketing campaigns.