Tata Praising or Tata Bashing can be decided later but let us put certain facts straight.
1. Product Strategy - While Tatas had a head-start in the diesel hatch segment, way back in 1998, they chugged along for a decade without building a proper portfolio of passenger cars and relied just on one Indica and Indigo. So a hell lot of learning which could have come was wasted just because they followed the 'Truck and Bus' style of business which did not suit passenger cars.
Worst is that, this thinking continues within the company. The replacement of Tiago and Tigor is nowhere to be seen, leave along a refresh or a facelift which that car badly deserves.
2. Power train strategy - While Tatas started the Passenger car journey in 1998 in a proper way (not discounting the efforts of 1993 with the Estate, Sierra and Sumo), the gasoline engines fitted on the Indica were a generation behind with a 2 valve head and cast iron block. This was done to commonize parts with the Diesel engine and save costs. Even back then, Gasoline was the mainstay fuel of the hatches and Tata completely failed in developing a proper 4 cylinder, 4 valve aluminium gasoline engine for the next two and half decades. While 3 cylinders were quite Ok for smaller hatches, even the cost conscious Maruti had proper and silent 4 cylinder engines from the Wagon R onwards.
Ok so past is past and life gives a second chance. Well! the second chance was the launch of the Bolt and the Zest. Look what Tatas did, they plonked a turbocharger to that outdated 1.2 liter 2 valve cast iron engine and named it the Revotron. Despite all the advertising, how well that engine performed is something everyone knows. So missing an opportunity even when you try to rise back like a phoenix ???? What the hell were people smoking in powertrain planning and the engine design department is something i wonder ?
As i write this, they still do not have a decent 4 cylinder petrol engine in the portfolio. Talk about powertrain planning...

Ok so what about the 2.2 L block ? - the 2179cc block which started the common Rail journey in India for Tatas and Mahindras. Well TML was the first to adopt the same and Mahindra followed suit. To this date, tatas do not have a decent transverse engine and transaxle combo of this engine while Mahindra developed it at least a decade back and launched the first monocoque SUV, the XUV 500. Well! Tata could have learned from that and developed the East-West configuration of the 2.2 Dicor, which could have come in handy for the Harrier - Safari twins. No, that would be a very sensible decision and Tatas wouldn't take sensible decisions when it comes to Passenger car powertrains. The powertrain planners and designers deserve at least a 'Bharat ratna' in this case.

So the Harrier and Safari twins are with a bought out engine-gearbox combo from Fiat, forcing TML to price it higher than the XUV 700 which has become the 'Gold-Standard' for the segment
Even today, the Altroz, an otherwise capable vehicle is let down by an anaemic 3 pot engine and the company feels, it is just fine that way.
OK so Ford has exited India and the Sanand plant is taken over by TML, why don't you just licence out the 1 liter Ecoboost from them Mr TML ? looks like conventional wisdom fails to address things here
3. Product Planning and Styling Duds - now Tata has done better than many others in this area but still certain things need a mention.
After about a decade of the Indica, comes the Vista. Now from a distance how would one distinguish this vehicle from the old Indica is one point. More importantly, when parked next to each other, the old Indica definitely looked better. Mind you, this was after the Swift had set a benchmark in hatchback styling within the country around 2005
We all have seen the Aria and how it was conceived. A body on frame vehicle with a very plain and bland MUV type styling. Now which was the segment it was intended at ? OK leave alone powertrain planning, where on earth was product planning.
Let's talk rebirth; that vehicle was reborn as the Hexa. Definitely a decent effort but again with a confused styling which was somewhere between an SUV and MUV. When the whole world was moving towards SUVs and when diesel was still a mainstay fuel, TML could have simply launched a good SUV with that very capable chassis and Driveline combo. No, they didn't
Being a first mover everywhere has brought the company thus far. Now looking at competition, Mahindras had always played a follower game but ended up beating the Tatas everywhere, primarily riding on the strength of its diverse and capable powertrains. Now with a focus on styling, they look like they are poised to grow further. Tatas will still survive but maybe in the fourth of fifth position if the trend continues.