Not really. In fact, depending on when you last played, DM may have been buffed since you left. Siphon Life was made into a pretty serious attack, and Soul Drain was given a larger "base" bonus with just one foe in range (with additional foes adding less per foe). I can't think of a way that SR has changed in quite some time.
Blue
American Steele: 50 BS/Inv
Nightfall: 50 DDD
Sable Slayer: 50 DM/Rgn
Fortune's Shadow: 50 Dark/Psi
WinterStrike: 47 Ice/Dev
Quantum Well: 43 Inv/EM
Twilit Destiny: 43 MA/DA
Red
Shadowslip: 50 DDC
Final Rest: 50 MA/Rgn
Abyssal Frost: 50 Ice/Dark
Golden Ember: 50 SM/FA
Like UberGuy said nothing, Dark Melee as been buff and Siphon life is a great attack with a nice little heal that goes great with /SR. The only they you can said that made DM/SR a weaker combo is Shield Defense. With a lot of inf, and I mean a lot, DM/SD beat DM/SR in every way.
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Generalizing a bit from what BrokenPrey said, the only sense in which Dark Melee/Super Reflexes may be worse is that when I built mine (I12), I felt it was THE top performer for AV soloing. Now, due to new sets, new IOs, and a number of buffs, a lot of combinations are its equal or better in that regard. But it hasn't gone downhill in any absolute sense, and depending on when "a long time ago" was, it may have gotten significantly tougher since you last fiddled with it.
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Thanks for the replies guys. I'm glad to see that they boosted Siphon Life because that always felt like a wasted power.
A long time ago DM/SR used to be one of the toughest one vs one combinations because of the high +def and the user of -acc from each of the DM hits. With some enhancements you could literally tank Elite Bosses with ease and even give some AVs problems hitting you.
I did have a character which used this combo but the colour scheme made it quite dull and I didn't like the concept behind the character much. But with the color changing I noticed that DM makes for an excellent Radiation Melee with a reskin because of the lingering effects and smokey effect and some glows. But before I start, has there been any significant changes in the last couple years I won't be aware of which made DM/SR less of an uber-scranker?