Yes, they blocked Obama's nominee, as permitted under the Constitution. They did not attack him or falsely accuse him of moral turpitude.
To suggest that both scenarios are equal is either stupidity, or malevolence.
They had no need to attack him because they had the numbers. It's still the same game.
Both sides play dirty, nobody can deny that.
You don't understand. What the Republicans did was not "playing dirty". It was fully sanctioned by constitutional mandate.
Read the US Constitution, Article II, Section II.
It is assuredly NOT the same game.
I must respectfully disagree. The role of the Senate here is to, "advise and consent." Period. Vet the nominee (ie hearings) and vote up or down. The Republicans refused to do that. That's their prerogative, they have that power. It was blocking a constitutionally nominated person, that cannot be denied. What the Democrats are attempting is the same thing, it's just they don't have the numbers to use the same tactic, so they are attempting to smear his character. Either way, it's an attempt to block a constitutionally nominated person. How am I wrong?
There is no constitutional obligation for the Senate to advise and consent.
You are saying that because the Democrats don't have the numbers to legally block a nominee, they are justified in destroying a nominee's reputation via false accusations instead?
Absolutely not. They are acting like school yard bullies that have been usurped by an upperclassman and have gone running to the principal to get said upperclassman in trouble for some made up thing. It's reprehensible, unless these allegations are found to have some shred of evidence.
As for the obligation to advise and consent I refer you to Article II Section II clause II. I'll even give you the entire clause for your convenience:
"[The President] shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur; and he shall nominate, and by and with the Advice and Consent of the Senate, shall appoint Ambassadors, other public Ministers and Consuls, Judges of the
Supreme Court, and all other Officers of the United States, whose Appointments are not herein otherwise provided for, and which shall be established by Law: but the Congress may by Law vest the Appointment of such inferior Officers, as they think proper, in the President alone, in the Courts of Law, or in the Heads of Departments."
I'll even give you a link to the wiki page I got it from.
Advice and consent - Wikipedia
So, yes, they do have an obligation to advise and consent. Doesn't mean they have to ratify/agree. They MUST VOTE though.