If you're set on DM I'd make a DM/Nin - DM/Regen will feel frail, not take advantage of Dull Pain like the scrapper (and consequently because of the low hp cap, you'll regen less with dull pain up, also applicable to IH), and maybe 'too many heals' - with DM/Nin you'll have two and be softcapped with some IOs. Plus it's unique to Stalkers, I always advise people to roll their first Stalkers as /Nin since it's different and unique.
Indeed, Dull Pain won't help a stalker as much as a Scrapper, but really, DM/Regen is quite an efficient combo IMO. My main is a DM/Regen Stalker that I feel is very strong, and the to-hit debuff from DM works very well with the AS to-hit debuff to help the toon feel quite survivable, everything considered.
While I haven't played a /nin to lvl 50, I can't second Kioshi's observations, but really, if you don't mind playing the game with a lower difficulty (I usually play at +2/x2 on my DM/Regen, before and after my level-shift) with quite a strong ST chain, I would recommend you try it out 
I have yet to try using Shadow Maul in the build, so I can't give you any comments on that in the combo, but I believe it can help the difficulty to x3 or perhaps x4.
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The build looks solid to me, but if your goal is to find a Stalker you'll really like I wouldn't recommend starting with the secondary that is arguably least suited to a Stalker, that being Regen. The inability to benefit from the +HPs in Dull Pain is really quite significant.
On the other hand if you're really set on that combo I'd say go for it. With the build you posted I don't think you'll have any major survivability issues.
It will be fine at lower difficulties, but you will bring little to a team and will not be a fast soloer.
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Quote:
Nin is a very nice set because it's the only set you can softcap easily with IOs and have a very good self-heal (clone of Recon actually, if there's any difference it's some silly detail I won't check now because I'm sleepy). Blinding Powder is very nice too and doesn't unhide you, I never felt the need for Caltrops but some people love it.|
Originally Posted by JanusFrs
Indeed, Dull Pain won't help a stalker as much as a Scrapper, but really, DM/Regen is quite an efficient combo IMO. My main is a DM/Regen Stalker that I feel is very strong, and the to-hit debuff from DM works very well with the AS to-hit debuff to help the toon feel quite survivable, everything considered.
While I haven't played a /nin to lvl 50, I can't second Kioshi's observations, but really, if you don't mind playing the game with a lower difficulty (I usually play at +2/x2 on my DM/Regen, before and after my level-shift) with quite a strong ST chain, I would recommend you try it out I have yet to try using Shadow Maul in the build, so I can't give you any comments on that in the combo, but I believe it can help the difficulty to x3 or perhaps x4. |
Regen is not bad at all, I just hate the hp cap thing because it makes the power much less useful (unlike Crab Spiders who have Dull Pain and even with lower base hp than Stalkers can use it fully since their HP cap is 2409 instead of the lousy 1606 Stalkers get), I like my Elec/Regen.
I'd advise you to try Shadow Maul. I always loved it because my second 50 (way back in i10) was a dark/dark scrapper so I got used to hitting at least 2 targets, and 3, even 4 on tight packed mobs on a big team, if you don't mind doing a little repositioning before using it. Plus, SM is a cone attack with single-target damage/recharge/endurance ratios, so it's good even if you hit only one (only Midnight Grasp - and of course AS - does more damage than SM even considering you're hitting one mob). The only downside is the animation time which may be bad on a /regen because you're very dependent on your click powers so maybe it can get you killed sometimes, although I haven't been killed on my elec/regen using thunder strike which has a longer cast time.
One of my fastest toons to 50 was my DM/Regen Scrapper and I was just wondering if it is worthwhile to pursue the build on a stalker. I have heard about the aoe crit bonus for fireball and have never been able to "get into" a stalker but it is one of 4 AT's I dont have a 50 in yet.
So is it worth it to roll?