The patch advertised its murder of the sniper rifle as "encouraging people to use the sniper rifle as a sniper rifle." One of the things that patch did was to remove the 5X crit multiplier, which is most welcome. Unfortunately, the patch also cut base DAM by 20, down to 42. For a weapon that costs 4100 caps, this is way too much.
A common argument is that "you can still one shot things with sneak criticals." Well, of course you can, but that applies to all weapons with 40-50 damage:
Cowboy Repeater (+Cowboy) - 44 DAM
.44 revolver (+Cowboy) - 48 DAM
Trail carbine - 45 DAM or 56 DAM with Cowboy
12.7mm pistol - 40 DAM
Automatic Rifle (Dead Money) - 40 DAM
Shotguns
The majority of these weapons costs less - either in caps, AP, weight or all of the above. This list does not include weapons that do more than 50 damage, like This Machine, Hunting Revolver and the Brush Gun. A base DAM of 42 for a sniper rifle is frankly ridiculous when the Cowboy Repeater can do 44 DAM (while costing less, in everything, and having a higher HP).
If we were to compare the sniper rifle with the scoped trail carbine, the sniper rifle compares terribly. First off, the trail carbine has a higher rate of fire, and a larger clip. Second off, shot-per-shot, with all the damage applicable perks, the base DAM of the sniper rifle is 45, and the trail carbine is 60. Factoring in JSP and SWC ammo, respectively we get:
Sniper Rifle:
(45-DT)*1.5
= 45*1.5-1.5DT
= 67.5 - 1.5DT
Trail Carbine:
(60-DT)*1.2
= 60*1.2-1.2DT
= 72 - 1.2DT
Against a target with a DT of 10 and no DR, the Sniper Rifle+JSP would do 52.5 DAM, while the Trail Carbine would do 60 DAM (12.5% difference). Against a target with 20 DT and no DR, the sniper rifle would do 37.5 DAM, while the trail carbine does 48 DAM (32% difference).
The Trail Carbine also costs less in caps, weighs less, has a higher item HP, costs less AP and has the aforementioned higher rate of fire/clip size.
By now, the next common counter-argument is that the sniper rifle can be silenced. The thing with the silencer is, however, that it doesn't really come into play at long-range. Therefore, at long-range, having a silencer is not a "pro" for the sniper rifle. At medium/short-range, the silencer does come into play, but this is counter-balanced by the fact that the Trail Carbine costs only half as much to use in VATS (38 for SR and 21 for TC).
With the Trail Carbine, you can literally sneak up to a group of people and sneak attack critical 3-4 of them using VATS before anyone even knows you're there. This is a worthy trade-off to being not able to equip a silencer.
With the Brush gun arguably being the better weapon vs. the AMR, there is now no reason to go for a non-Cowboy character build if you're character is going to be using guns. There is also now no reason to use the Gobi Sniper Rifle. Why did the Sniper Rifle's base damage have to be nerfed to 42? If anything, given the dominance of the brush gun and the Guass/YCS rifles, and also the versatility of the trail carbine, they should've increased the base DAM of the sniper rifle after the 5X crit multiplier was removed.
EDIT: Things as they stand now
DAM vs. DT : Comparison of Sniper Rifle (JSP and AP), Cowboy Repeater (JFP) and the Trail Carbine (SWP)
http://img267.imageshack.us/img267/2340/fnvy.jpg